diff --git a/gpkit/constraints/loose.py b/gpkit/constraints/loose.py
index e0621e6b..fb5840d5 100644
--- a/gpkit/constraints/loose.py
+++ b/gpkit/constraints/loose.py
@@ -16,6 +16,10 @@ def process_result(self, result):
         "Checks that all constraints are satisfied with equality"
         super().process_result(result)
         initsolwarning(result, "Unexpectedly Tight Constraints")
+        if "sensitivities" not in result:
+            appendsolwarning("Could not evaluate due to choice variables.",
+                             (), result, "Unexpectedly Tight Constraints")
+            return
         for constraint in self.flat():
             c_senss = result["sensitivities"]["constraints"].get(constraint, 0)
             if c_senss >= self.senstol:
diff --git a/gpkit/constraints/sgp.py b/gpkit/constraints/sgp.py
index 0ab40ade..ff3ef5a9 100644
--- a/gpkit/constraints/sgp.py
+++ b/gpkit/constraints/sgp.py
@@ -213,15 +213,16 @@ def localsolve(self, solver=None, *, verbosity=1, x0=None, reltol=1e-4,
             self.result["cost function"] = self.cost
             del self.result["freevariables"][self.slack.key]  # pylint: disable=no-member
             del self.result["variables"][self.slack.key]  # pylint: disable=no-member
-            del self.result["sensitivities"]["variables"][self.slack.key]  # pylint: disable=no-member
-            del self.result["sensitivities"]["variablerisk"][self.slack.key]  # pylint: disable=no-member
-            slcon = self.gpconstraints[0]
-            slconsenss = self.result["sensitivities"]["constraints"][slcon]
-            del self.result["sensitivities"]["constraints"][slcon]
-            # TODO: create constraint in RelaxPCCP namespace
-            self.result["sensitivities"]["models"][""] -= slconsenss
-            if not self.result["sensitivities"]["models"][""]:
-                del self.result["sensitivities"]["models"][""]
+            if "sensitivities" in self.result:  # not true for MIGP
+                del self.result["sensitivities"]["variables"][self.slack.key]  # pylint: disable=no-member
+                del self.result["sensitivities"]["variablerisk"][self.slack.key]  # pylint: disable=no-member
+                slcon = self.gpconstraints[0]
+                slconsenss = self.result["sensitivities"]["constraints"][slcon]
+                del self.result["sensitivities"]["constraints"][slcon]
+                # TODO: create constraint in RelaxPCCP namespace
+                self.result["sensitivities"]["models"][""] -= slconsenss
+                if not self.result["sensitivities"]["models"][""]:
+                    del self.result["sensitivities"]["models"][""]
         return self.result
 
     @property
diff --git a/gpkit/solution_array.py b/gpkit/solution_array.py
index f11fea38..8c9d088b 100644
--- a/gpkit/solution_array.py
+++ b/gpkit/solution_array.py
@@ -41,7 +41,9 @@ def __init__(self, solarray, saveconstraints):
 
 
     def __enter__(self):
-        if self.saveconstraints:
+        if "sensitivities" not in self.solarray:
+            pass
+        elif self.saveconstraints:
             for constraint_attr in ["bounded", "meq_bounded", "vks",
                                     "v_ss", "unsubbed", "varkeys"]:
                 store = {}
@@ -55,7 +57,9 @@ def __enter__(self):
                 self.solarray["sensitivities"].pop("constraints")
 
     def __exit__(self, type_, val, traceback):
-        if self.saveconstraints:
+        if not self.constraintstore:
+            pass
+        elif self.saveconstraints:
             for constraint_attr, store in self.attrstore.items():
                 for constraint, value in store.items():
                     setattr(constraint, constraint_attr, value)
@@ -772,7 +776,8 @@ def table(self, showvars=(),
         strs = []
         for table in tables:
             if "breakdown" in table:
-                if len(self) > 1 or not UNICODE_EXPONENTS:
+                if (len(self) > 1 or not UNICODE_EXPONENTS
+                        or "sensitivities" not in self):
                     # no breakdowns for sweeps or no-unicode environments
                     table = table.replace(" breakdown", "")
             if "sensitivities" not in self and ("sensitivities" in table or