diff --git a/binding.gyp b/binding.gyp
index 8a5176924..ec57d30e0 100644
--- a/binding.gyp
+++ b/binding.gyp
@@ -60,22 +60,12 @@
               '-std=c++11'
             ],
             'OTHER_LDFLAGS': [],
-            'GCC_ENABLE_CPP_EXCEPTIONS': 'YES',
+            'GCC_ENABLE_CPP_EXCEPTIONS': 'NO',
             'MACOSX_DEPLOYMENT_TARGET': '10.7'
           }
         }],
-        ['OS=="win"', {
-          'msvs_settings': {
-            'VCCLCompilerTool': {
-              'AdditionalOptions': [
-                '/EHsc'
-              ]
-            }
-          }
-        }],
         ['OS!="win"', {
           'cflags_cc+': [
-            '-fexceptions',
             '-std=c++0x'
           ]
         }]
diff --git a/src/binding.cpp b/src/binding.cpp
index 19050039f..cb7beafbc 100644
--- a/src/binding.cpp
+++ b/src/binding.cpp
@@ -29,12 +29,7 @@ union Sass_Value* sass_custom_function(const union Sass_Value* s_args, Sass_Func
     argv.push_back((void*)sass_list_get_value(s_args, i));
   }
 
-  try {
-    return bridge(argv);
-  }
-  catch (const std::exception& e) {
-    return sass_make_error(e.what());
-  }
+  return bridge(argv);
 }
 
 int ExtractOptions(v8::Local<v8::Object> options, void* cptr, sass_context_wrapper* ctx_w, bool is_file, bool is_sync) {
diff --git a/src/callback_bridge.h b/src/callback_bridge.h
index b95887c34..cf749c1b8 100644
--- a/src/callback_bridge.h
+++ b/src/callback_bridge.h
@@ -98,7 +98,12 @@ T CallbackBridge<T, L>::operator()(std::vector<void*> argv) {
      * post_process_args().
      */
     Nan::HandleScope scope;
+    Nan::TryCatch try_catch;
     std::vector<v8::Local<v8::Value>> argv_v8 = pre_process_args(argv);
+    if (try_catch.HasCaught()) {
+      Nan::FatalException(try_catch);
+    }
+
     argv_v8.push_back(Nan::New(wrapper));
 
     return this->post_process_return_value(
@@ -149,6 +154,9 @@ void CallbackBridge<T, L>::dispatched_async_uv_callback(uv_async_t *req) {
   Nan::TryCatch try_catch;
 
   std::vector<v8::Local<v8::Value>> argv_v8 = bridge->pre_process_args(bridge->argv);
+  if (try_catch.HasCaught()) {
+    Nan::FatalException(try_catch);
+  }
   argv_v8.push_back(Nan::New(bridge->wrapper));
 
   bridge->callback->Call(argv_v8.size(), &argv_v8[0]);
diff --git a/src/custom_function_bridge.cpp b/src/custom_function_bridge.cpp
index 9885d0482..f0e49b6c8 100644
--- a/src/custom_function_bridge.cpp
+++ b/src/custom_function_bridge.cpp
@@ -2,13 +2,14 @@
 #include <stdexcept>
 #include "custom_function_bridge.h"
 #include "sass_types/factory.h"
+#include "sass_types/value.h"
 
 Sass_Value* CustomFunctionBridge::post_process_return_value(v8::Local<v8::Value> val) const {
-  try {
-    return SassTypes::Factory::unwrap(val)->get_sass_value();
-  }
-  catch (const std::invalid_argument& e) {
-    return sass_make_error(e.what());
+  SassTypes::Value *v_;
+  if ((v_ = SassTypes::Factory::unwrap(val))) {
+    return v_->get_sass_value();
+  } else {
+    return sass_make_error("A SassValue object was expected.");
   }
 }
 
diff --git a/src/sass_types/boolean.cpp b/src/sass_types/boolean.cpp
index ebc2b2f37..89c7a9659 100644
--- a/src/sass_types/boolean.cpp
+++ b/src/sass_types/boolean.cpp
@@ -67,6 +67,9 @@ namespace SassTypes
   }
 
   NAN_METHOD(Boolean::GetValue) {
-    info.GetReturnValue().Set(Nan::New(static_cast<Boolean*>(Factory::unwrap(info.This()))->value));
+    Boolean *out;
+    if ((out = static_cast<Boolean*>(Factory::unwrap(info.This())))) { 
+      info.GetReturnValue().Set(Nan::New(out->value));
+    }
   }
 }
diff --git a/src/sass_types/color.cpp b/src/sass_types/color.cpp
index 8f8efba87..ed22b13cb 100644
--- a/src/sass_types/color.cpp
+++ b/src/sass_types/color.cpp
@@ -5,14 +5,14 @@ namespace SassTypes
 {
   Color::Color(Sass_Value* v) : SassValueWrapper(v) {}
 
-  Sass_Value* Color::construct(const std::vector<v8::Local<v8::Value>> raw_val) {
+  Sass_Value* Color::construct(const std::vector<v8::Local<v8::Value>> raw_val, Sass_Value **out) {
     double a = 1.0, r = 0, g = 0, b = 0;
     unsigned argb;
 
     switch (raw_val.size()) {
     case 1:
       if (!raw_val[0]->IsNumber()) {
-        throw std::invalid_argument("Only argument should be an integer.");
+        return fail("Only argument should be an integer.", out);
       }
 
       argb = Nan::To<int32_t>(raw_val[0]).FromJust();
@@ -24,7 +24,7 @@ namespace SassTypes
 
     case 4:
       if (!raw_val[3]->IsNumber()) {
-        throw std::invalid_argument("Constructor arguments should be numbers exclusively.");
+        return fail("Constructor arguments should be numbers exclusively.", out);
       }
 
       a = Nan::To<double>(raw_val[3]).FromJust();
@@ -32,7 +32,7 @@ namespace SassTypes
 
     case 3:
       if (!raw_val[0]->IsNumber() || !raw_val[1]->IsNumber() || !raw_val[2]->IsNumber()) {
-        throw std::invalid_argument("Constructor arguments should be numbers exclusively.");
+        return fail("Constructor arguments should be numbers exclusively.", out);
       }
 
       r = Nan::To<double>(raw_val[0]).FromJust();
@@ -44,10 +44,10 @@ namespace SassTypes
       break;
 
     default:
-      throw std::invalid_argument("Constructor should be invoked with either 0, 1, 3 or 4 arguments.");
+      return fail("Constructor should be invoked with either 0, 1, 3 or 4 arguments.", out);
     }
 
-    return sass_make_color(r, g, b, a);
+    return *out = sass_make_color(r, g, b, a);
   }
 
   void Color::initPrototype(v8::Local<v8::FunctionTemplate> proto) {
diff --git a/src/sass_types/color.h b/src/sass_types/color.h
index 7ef10db19..0be355110 100644
--- a/src/sass_types/color.h
+++ b/src/sass_types/color.h
@@ -10,7 +10,7 @@ namespace SassTypes
     public:
       Color(Sass_Value*);
       static char const* get_constructor_name() { return "SassColor"; }
-      static Sass_Value* construct(const std::vector<v8::Local<v8::Value>>);
+      static Sass_Value* construct(const std::vector<v8::Local<v8::Value>>, Sass_Value **);
 
       static void initPrototype(v8::Local<v8::FunctionTemplate>);
 
diff --git a/src/sass_types/error.cpp b/src/sass_types/error.cpp
index f02dd12dc..03c6307c4 100644
--- a/src/sass_types/error.cpp
+++ b/src/sass_types/error.cpp
@@ -6,18 +6,18 @@ namespace SassTypes
 {
   Error::Error(Sass_Value* v) : SassValueWrapper(v) {}
 
-  Sass_Value* Error::construct(const std::vector<v8::Local<v8::Value>> raw_val) {
+  Sass_Value* Error::construct(const std::vector<v8::Local<v8::Value>> raw_val, Sass_Value **out) {
     char const* value = "";
 
     if (raw_val.size() >= 1) {
       if (!raw_val[0]->IsString()) {
-        throw std::invalid_argument("Argument should be a string.");
+        return fail("Argument should be a string.", out);
       }
 
       value = create_string(raw_val[0]);
     }
 
-    return sass_make_error(value);
+    return *out = sass_make_error(value);
   }
 
   void Error::initPrototype(v8::Local<v8::FunctionTemplate>) {}
diff --git a/src/sass_types/error.h b/src/sass_types/error.h
index ada3769f3..01786fdaa 100644
--- a/src/sass_types/error.h
+++ b/src/sass_types/error.h
@@ -10,7 +10,7 @@ namespace SassTypes
     public:
       Error(Sass_Value*);
       static char const* get_constructor_name() { return "SassError"; }
-      static Sass_Value* construct(const std::vector<v8::Local<v8::Value>>);
+      static Sass_Value* construct(const std::vector<v8::Local<v8::Value>>, Sass_Value **);
 
       static void initPrototype(v8::Local<v8::FunctionTemplate>);
   };
diff --git a/src/sass_types/factory.cpp b/src/sass_types/factory.cpp
index 9bcf07005..1c91f7a2f 100644
--- a/src/sass_types/factory.cpp
+++ b/src/sass_types/factory.cpp
@@ -39,7 +39,9 @@ namespace SassTypes
       return new Error(v);
 
     default:
-      throw std::invalid_argument("Unknown type encountered.");
+      const char *msg = "Unknown type encountered.";
+      Nan::ThrowTypeError(Nan::New<v8::String>(msg).ToLocalChecked());
+      return new Error(sass_make_error(msg));
     }
   }
 
@@ -61,7 +63,7 @@ namespace SassTypes
   Value* Factory::unwrap(v8::Local<v8::Value> obj) {
     // Todo: non-SassValue objects could easily fall under that condition, need to be more specific.
     if (!obj->IsObject() || obj.As<v8::Object>()->InternalFieldCount() != 1) {
-      throw std::invalid_argument("A SassValue object was expected.");
+      return NULL;
     }
 
     return static_cast<Value*>(Nan::GetInternalFieldPointer(obj.As<v8::Object>(), 0));
diff --git a/src/sass_types/list.cpp b/src/sass_types/list.cpp
index 4e9515f95..a337d638e 100644
--- a/src/sass_types/list.cpp
+++ b/src/sass_types/list.cpp
@@ -5,27 +5,27 @@ namespace SassTypes
 {
   List::List(Sass_Value* v) : SassValueWrapper(v) {}
 
-  Sass_Value* List::construct(const std::vector<v8::Local<v8::Value>> raw_val) {
+  Sass_Value* List::construct(const std::vector<v8::Local<v8::Value>> raw_val, Sass_Value **out) {
     size_t length = 0;
     bool comma = true;
 
     if (raw_val.size() >= 1) {
       if (!raw_val[0]->IsNumber()) {
-        throw std::invalid_argument("First argument should be an integer.");
+        return fail("First argument should be an integer.", out);
       }
 
       length = Nan::To<uint32_t>(raw_val[0]).FromJust();
 
       if (raw_val.size() >= 2) {
         if (!raw_val[1]->IsBoolean()) {
-          throw std::invalid_argument("Second argument should be a boolean.");
+          return fail("Second argument should be a boolean.", out);
         }
 
         comma = Nan::To<bool>(raw_val[1]).FromJust();
       }
     }
 
-    return sass_make_list(length, comma ? SASS_COMMA : SASS_SPACE);
+    return *out = sass_make_list(length, comma ? SASS_COMMA : SASS_SPACE);
   }
 
   void List::initPrototype(v8::Local<v8::FunctionTemplate> proto) {
@@ -71,7 +71,11 @@ namespace SassTypes
     }
 
     Value* sass_value = Factory::unwrap(info[1]);
-    sass_list_set_value(unwrap(info.This())->value, Nan::To<uint32_t>(info[0]).FromJust(), sass_value->get_sass_value());
+    if (sass_value) {
+      sass_list_set_value(unwrap(info.This())->value, Nan::To<uint32_t>(info[0]).FromJust(), sass_value->get_sass_value());
+    } else {
+      Nan::ThrowTypeError(Nan::New<v8::String>("A SassValue is expected as the list item").ToLocalChecked());
+    }
   }
 
   NAN_METHOD(List::GetSeparator) {
diff --git a/src/sass_types/list.h b/src/sass_types/list.h
index 5f3a3aeac..c43b75484 100644
--- a/src/sass_types/list.h
+++ b/src/sass_types/list.h
@@ -10,7 +10,7 @@ namespace SassTypes
     public:
       List(Sass_Value*);
       static char const* get_constructor_name() { return "SassList"; }
-      static Sass_Value* construct(const std::vector<v8::Local<v8::Value>>);
+      static Sass_Value* construct(const std::vector<v8::Local<v8::Value>>, Sass_Value **);
 
       static void initPrototype(v8::Local<v8::FunctionTemplate>);
 
diff --git a/src/sass_types/map.cpp b/src/sass_types/map.cpp
index 2be305b5a..147de42f4 100644
--- a/src/sass_types/map.cpp
+++ b/src/sass_types/map.cpp
@@ -5,18 +5,18 @@ namespace SassTypes
 {
   Map::Map(Sass_Value* v) : SassValueWrapper(v) {}
 
-  Sass_Value* Map::construct(const std::vector<v8::Local<v8::Value>> raw_val) {
+  Sass_Value* Map::construct(const std::vector<v8::Local<v8::Value>> raw_val, Sass_Value **out) {
     size_t length = 0;
 
     if (raw_val.size() >= 1) {
       if (!raw_val[0]->IsNumber()) {
-        throw std::invalid_argument("First argument should be an integer.");
+        return fail("First argument should be an integer.", out);
       }
 
       length = Nan::To<uint32_t>(raw_val[0]).FromJust();
     }
 
-    return sass_make_map(length);
+    return *out = sass_make_map(length);
   }
 
   void Map::initPrototype(v8::Local<v8::FunctionTemplate> proto) {
@@ -62,7 +62,11 @@ namespace SassTypes
     }
 
     Value* sass_value = Factory::unwrap(info[1]);
-    sass_map_set_value(unwrap(info.This())->value, Nan::To<uint32_t>(info[0]).FromJust(), sass_value->get_sass_value());
+    if (sass_value) {
+      sass_map_set_value(unwrap(info.This())->value, Nan::To<uint32_t>(info[0]).FromJust(), sass_value->get_sass_value());
+    } else {
+      Nan::ThrowTypeError(Nan::New<v8::String>("A SassValue is expected as a map value").ToLocalChecked());
+    }
   }
 
   NAN_METHOD(Map::GetKey) {
@@ -100,7 +104,11 @@ namespace SassTypes
     }
 
     Value* sass_value = Factory::unwrap(info[1]);
-    sass_map_set_key(unwrap(info.This())->value, Nan::To<uint32_t>(info[0]).FromJust(), sass_value->get_sass_value());
+    if (sass_value) {
+      sass_map_set_key(unwrap(info.This())->value, Nan::To<uint32_t>(info[0]).FromJust(), sass_value->get_sass_value());
+    } else {
+      Nan::ThrowTypeError(Nan::New<v8::String>("A SassValue is expected as a map key").ToLocalChecked());
+    }
   }
 
   NAN_METHOD(Map::GetLength) {
diff --git a/src/sass_types/map.h b/src/sass_types/map.h
index 26fc2286d..832585dd5 100644
--- a/src/sass_types/map.h
+++ b/src/sass_types/map.h
@@ -10,7 +10,7 @@ namespace SassTypes
     public:
       Map(Sass_Value*);
       static char const* get_constructor_name() { return "SassMap"; }
-      static Sass_Value* construct(const std::vector<v8::Local<v8::Value>>);
+      static Sass_Value* construct(const std::vector<v8::Local<v8::Value>>, Sass_Value **);
 
       static void initPrototype(v8::Local<v8::FunctionTemplate>);
 
diff --git a/src/sass_types/number.cpp b/src/sass_types/number.cpp
index b832e809b..1605516b2 100644
--- a/src/sass_types/number.cpp
+++ b/src/sass_types/number.cpp
@@ -6,27 +6,27 @@ namespace SassTypes
 {
   Number::Number(Sass_Value* v) : SassValueWrapper(v) {}
 
-  Sass_Value* Number::construct(const std::vector<v8::Local<v8::Value>> raw_val) {
+  Sass_Value* Number::construct(const std::vector<v8::Local<v8::Value>> raw_val, Sass_Value **out) {
     double value = 0;
     char const* unit = "";
 
     if (raw_val.size() >= 1) {
       if (!raw_val[0]->IsNumber()) {
-        throw std::invalid_argument("First argument should be a number.");
+        return fail("First argument should be a number.", out);
       }
 
       value = Nan::To<double>(raw_val[0]).FromJust();
 
       if (raw_val.size() >= 2) {
         if (!raw_val[1]->IsString()) {
-          throw std::invalid_argument("Second argument should be a string.");
+          return fail("Second argument should be a string.", out);
         }
 
         unit = create_string(raw_val[1]);
       }
     }
 
-    return sass_make_number(value, unit);
+    return *out = sass_make_number(value, unit);
   }
 
   void Number::initPrototype(v8::Local<v8::FunctionTemplate> proto) {
diff --git a/src/sass_types/number.h b/src/sass_types/number.h
index b228d25fa..48a02361f 100644
--- a/src/sass_types/number.h
+++ b/src/sass_types/number.h
@@ -11,7 +11,7 @@ namespace SassTypes
     public:
       Number(Sass_Value*);
       static char const* get_constructor_name() { return "SassNumber"; }
-      static Sass_Value* construct(const std::vector<v8::Local<v8::Value>>);
+      static Sass_Value* construct(const std::vector<v8::Local<v8::Value>>, Sass_Value **out);
 
       static void initPrototype(v8::Local<v8::FunctionTemplate>);
 
diff --git a/src/sass_types/sass_value_wrapper.h b/src/sass_types/sass_value_wrapper.h
index aed4e2e34..54eb16a02 100644
--- a/src/sass_types/sass_value_wrapper.h
+++ b/src/sass_types/sass_value_wrapper.h
@@ -25,6 +25,7 @@ namespace SassTypes
       static v8::Local<v8::Function> get_constructor();
       static v8::Local<v8::FunctionTemplate> get_constructor_template();
       static NAN_METHOD(New);
+      static Sass_Value *fail(const char *, Sass_Value **);
 
     protected:
       Sass_Value* value;
@@ -94,15 +95,15 @@ namespace SassTypes
       localArgs[i] = info[i];
     }
     if (info.IsConstructCall()) {
-      try {
-        Sass_Value* value = T::construct(localArgs);
+      Sass_Value* value;
+      if (T::construct(localArgs, &value) != NULL) {
         T* obj = new T(value);
         sass_delete_value(value);
 
         Nan::SetInternalFieldPointer(info.This(), 0, obj);
         obj->js_object.Reset(info.This());
-      } catch (const std::exception& e) {
-        return Nan::ThrowError(Nan::New<v8::String>(e.what()).ToLocalChecked());
+      } else {
+        return Nan::ThrowError(Nan::New<v8::String>(sass_error_get_message(value)).ToLocalChecked());
       }
     } else {
       v8::Local<v8::Function> cons = T::get_constructor();
@@ -117,8 +118,15 @@ namespace SassTypes
 
   template <class T>
   T* SassValueWrapper<T>::unwrap(v8::Local<v8::Object> obj) {
+    /* This maybe NULL */
     return static_cast<T*>(Factory::unwrap(obj));
   }
+
+  template <class T>
+  Sass_Value *SassValueWrapper<T>::fail(const char *reason, Sass_Value **out) {
+    *out = sass_make_error(reason);
+    return NULL;
+  }
 }
 
 
diff --git a/src/sass_types/string.cpp b/src/sass_types/string.cpp
index 2c2373ac6..d97095bbc 100644
--- a/src/sass_types/string.cpp
+++ b/src/sass_types/string.cpp
@@ -6,18 +6,18 @@ namespace SassTypes
 {
   String::String(Sass_Value* v) : SassValueWrapper(v) {}
 
-  Sass_Value* String::construct(const std::vector<v8::Local<v8::Value>> raw_val) {
+  Sass_Value* String::construct(const std::vector<v8::Local<v8::Value>> raw_val, Sass_Value **out) {
     char const* value = "";
 
     if (raw_val.size() >= 1) {
       if (!raw_val[0]->IsString()) {
-        throw std::invalid_argument("Argument should be a string.");
+        return fail("Argument should be a string.", out);
       }
 
       value = create_string(raw_val[0]);
     }
 
-    return sass_make_string(value);
+    return *out = sass_make_string(value);
   }
 
   void String::initPrototype(v8::Local<v8::FunctionTemplate> proto) {
diff --git a/src/sass_types/string.h b/src/sass_types/string.h
index c7942a86d..2e72c8251 100644
--- a/src/sass_types/string.h
+++ b/src/sass_types/string.h
@@ -10,7 +10,7 @@ namespace SassTypes
     public:
       String(Sass_Value*);
       static char const* get_constructor_name() { return "SassString"; }
-      static Sass_Value* construct(const std::vector<v8::Local<v8::Value>>);
+      static Sass_Value* construct(const std::vector<v8::Local<v8::Value>>, Sass_Value **);
 
       static void initPrototype(v8::Local<v8::FunctionTemplate>);
 
diff --git a/test/api.js b/test/api.js
index 5e733fe48..0796444da 100644
--- a/test/api.js
+++ b/test/api.js
@@ -859,6 +859,72 @@ describe('api', function() {
       });
     });
 
+    it('should fail when trying to set a bare number as the List item', function(done) {
+      sass.render({
+        data: 'div { color: foo(); }',
+        functions: {
+          'foo()': function() {
+            var out = new sass.types.List(1);
+            out.setValue(0, 2);
+            return out;
+          }
+        }
+      }, function(error) {
+        assert.ok(/Supplied value should be a SassValue object/.test(error.message));
+        done();
+      });
+    });
+
+    it('should fail when trying to set a bare Object as the List item', function(done) {
+      sass.render({
+        data: 'div { color: foo(); }',
+        functions: {
+          'foo()': function() {
+            var out = new sass.types.List(1);
+            out.setValue(0, {});
+            return out;
+          }
+        }
+      }, function(error) {
+        assert.ok(/A SassValue is expected as the list item/.test(error.message));
+        done();
+      });
+    });
+
+    it('should fail when trying to set a bare Object as the Map key', function(done) {
+      sass.render({
+        data: 'div { color: foo(); }',
+        functions: {
+          'foo()': function() {
+            var out = new sass.types.Map(1);
+            out.setKey(0, {});
+            out.setValue(0, new sass.types.String('aaa'));
+            return out;
+          }
+        }
+      }, function(error) {
+        assert.ok(/A SassValue is expected as a map key/.test(error.message));
+        done();
+      });
+    });
+
+    it('should fail when trying to set a bare Object as the Map value', function(done) {
+      sass.render({
+        data: 'div { color: foo(); }',
+        functions: {
+          'foo()': function() {
+            var out = new sass.types.Map(1);
+            out.setKey(0, new sass.types.String('aaa'));
+            out.setValue(0, {});
+            return out;
+          }
+        }
+      }, function(error) {
+        assert.ok(/A SassValue is expected as a map value/.test(error.message));
+        done();
+      });
+    });
+
     it('should always map null, true and false to the same (immutable) object', function(done) {
       var counter = 0;