tweaked get return

src/symbol_table.c

@@ -541,6 +541,11 @@ TableNode *getReturn(TableNode *definition) {
             "not checking the return of a function -- invalid op");
         return undefined;
     }
+    if(definition->additionalinfo == NULL){
+        printdebug(
+            "node has NULL additionalinfo. Invalid.");
+        return undefined;
+    }
     return definition->additionalinfo->FunTypeAdInfo->returntype;
 }