Check for null map in matchtag().

sourcepawn/compiler/sc3.c

@@ -384,7 +384,7 @@ static int matchobjecttags(int formaltag, int actualtag, int flags)
     // Some methodmaps are nullable. The nullable property is inherited
     // automatically.
     methodmap_t *map = methodmap_find_by_tag(formaltag);
-    if (map->nullable)
+    if (map && map->nullable)
       return TRUE;
 
     error(148, pc_tagname(formaltag));

sourcepawn/compiler/tests/fail-assign-null-to-any.sp

@@ -0,0 +1,4 @@
+Foo(any foo) {}
+public Bar() {
+  Foo(null);
+}

sourcepawn/compiler/tests/fail-assign-null-to-any.txt

@@ -0,0 +1 @@
+(3) : error 148: cannot assign null to a non-nullable type