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-rw-r--r--src/types.cpp3
1 files changed, 3 insertions, 0 deletions
diff --git a/src/types.cpp b/src/types.cpp
index e6010b1e5..cd610d3cb 100644
--- a/src/types.cpp
+++ b/src/types.cpp
@@ -1338,6 +1338,9 @@ bool is_type_polymorphic(Type *t, bool or_specialized=false) {
break;
case Type_Map:
+ if (t->Map.key == nullptr || t->Map.value == nullptr) {
+ return false;
+ }
if (is_type_polymorphic(t->Map.key, or_specialized)) {
return true;
}