diff --git a/speedy_antlr_tool/__about__.py b/speedy_antlr_tool/__about__.py
index 9c73af2..f708a9b 100644
--- a/speedy_antlr_tool/__about__.py
+++ b/speedy_antlr_tool/__about__.py
@@ -1 +1 @@
-__version__ = "1.3.1"
+__version__ = "1.3.2"
diff --git a/speedy_antlr_tool/extractor.py b/speedy_antlr_tool/extractor.py
index 6b2660c..a89d0f9 100644
--- a/speedy_antlr_tool/extractor.py
+++ b/speedy_antlr_tool/extractor.py
@@ -53,7 +53,7 @@ def get_rule_labels(context_cls:antlr4.ParserRuleContext) -> List[str]:
     labels = []
     for line in lines:
         m = re.match(r'self\.(\w+)\s*=\s*None', line.strip())
-        if m:
+        if m and not m.group(1).startswith("_"):
             labels.append(m.group(1))
 
     return labels
diff --git a/speedy_antlr_tool/templates/sa_X_cpp_parser.cpp b/speedy_antlr_tool/templates/sa_X_cpp_parser.cpp
index 20e8752..b80205e 100644
--- a/speedy_antlr_tool/templates/sa_X_cpp_parser.cpp
+++ b/speedy_antlr_tool/templates/sa_X_cpp_parser.cpp
@@ -7,6 +7,7 @@
 #include <Python.h>
 
 #include <cstring>
+#include <any>
 
 #include "antlr4-runtime.h"
 #include "{{grammar_name}}Lexer.h"
diff --git a/speedy_antlr_tool/templates/speedy_antlr.cpp b/speedy_antlr_tool/templates/speedy_antlr.cpp
index 67dbdd6..12f0cf7 100644
--- a/speedy_antlr_tool/templates/speedy_antlr.cpp
+++ b/speedy_antlr_tool/templates/speedy_antlr.cpp
@@ -4,6 +4,7 @@
  */
 
 #include "speedy_antlr.h"
+#include <any>
 
 using namespace speedy_antlr;
 
@@ -155,7 +156,7 @@ PyObject* Translator::convert_ctx(
             Py_INCREF(py_label_candidate);
 
             // Get start/stop
-            if(!start){
+            if(!start || start==Py_None){
                 start = py_token;
                 Py_INCREF(start);
             }
@@ -172,18 +173,18 @@ PyObject* Translator::convert_ctx(
             } catch(PythonException &e) {
                 Py_XDECREF(py_ctx);
                 Py_XDECREF(py_children);
+                throw;
             }
             PyObject_SetAttrString(py_child, "parentCtx", py_ctx);
             py_label_candidate = py_child;
             Py_INCREF(py_label_candidate);
 
             // Get start/stop
-            if(i == 0) {
+            if(!start || start==Py_None) {
                 start = PyObject_GetAttrString(py_child, "start");
             }
-            if(i == ctx->children.size() - 1){
-                stop = PyObject_GetAttrString(py_child, "stop");
-            }
+            PyObject *tmp_stop = PyObject_GetAttrString(py_child, "stop");
+            if (tmp_stop && tmp_stop!=Py_None) stop = tmp_stop;
         } else {
             PyErr_SetString(PyExc_RuntimeError, "Unknown child type");
             throw PythonException();
diff --git a/speedy_antlr_tool/validate.py b/speedy_antlr_tool/validate.py
index c4e6619..ee968d9 100644
--- a/speedy_antlr_tool/validate.py
+++ b/speedy_antlr_tool/validate.py
@@ -1,7 +1,7 @@
 import re
 import inspect
 
-from antlr4 import ParserRuleContext
+from antlr4 import InputStream, ParserRuleContext
 from antlr4.tree.Tree import TerminalNodeImpl
 from antlr4.Token import Token, CommonToken
 
@@ -14,25 +14,34 @@ def validate_top_ctx(py_ctx:ParserRuleContext, cpp_ctx:ParserRuleContext):
 
 def validate_ctx(py_ctx:ParserRuleContext, cpp_ctx:ParserRuleContext):
     assert type(py_ctx) == type(cpp_ctx)
-    assert len(py_ctx.children) == len(cpp_ctx.children)
+    pc = list(py_ctx.getChildren())
+    cc = list(cpp_ctx.getChildren())
+    assert len(pc) == len(cc)
 
     # Validate children
-    for i in range(len(py_ctx.children)):
-        if isinstance(py_ctx.children[i], TerminalNodeImpl):
-            validate_tnode(py_ctx.children[i], cpp_ctx.children[i])
-        elif isinstance(py_ctx.children[i], ParserRuleContext):
-            validate_ctx(py_ctx.children[i], cpp_ctx.children[i])
+    for i in range(len(pc)):
+        if isinstance(pc[i], TerminalNodeImpl):
+            validate_tnode(pc[i], cc[i])
+        elif isinstance(pc[i], ParserRuleContext):
+            validate_ctx(pc[i], cc[i])
         else:
             raise RuntimeError
-        assert py_ctx.children[i].parentCtx is py_ctx
-        assert cpp_ctx.children[i].parentCtx is cpp_ctx
+        assert pc[i].parentCtx is py_ctx
+        assert cc[i].parentCtx is cpp_ctx
     
     # Validate start/stop markers
-    validate_common_token(py_ctx.start, cpp_ctx.start)
-    validate_common_token(py_ctx.stop, cpp_ctx.stop)
+    if (py_ctx.start is not None 
+        and py_ctx.stop is not None
+        and py_ctx.start.type != Token.EOF
+        and py_ctx.stop.type != Token.EOF
+        and py_ctx.start.tokenIndex <= py_ctx.stop.tokenIndex):
+        validate_common_token(py_ctx.start, cpp_ctx.start)
+        validate_common_token(py_ctx.stop, cpp_ctx.stop)
 
     # Validate labels
     for label in get_rule_labels(py_ctx):
+        if label.startswith("_"):
+            continue
         py_label = getattr(py_ctx, label)
         cpp_label = getattr(cpp_ctx, label)
         assert type(py_label) == type(cpp_label)
@@ -64,4 +73,4 @@ def validate_common_token(py_tok:CommonToken, cpp_tok:CommonToken):
     assert py_tok.line == cpp_tok.line
     assert py_tok.column == cpp_tok.column
     assert py_tok.text == cpp_tok.text
-    assert py_tok.getInputStream() is cpp_tok.getInputStream()
+    assert isinstance(cpp_tok.getInputStream(), InputStream)