diff --git a/polymer/eduke32/source/game.c b/polymer/eduke32/source/game.c
index e3cc7310b..e89208f48 100644
--- a/polymer/eduke32/source/game.c
+++ b/polymer/eduke32/source/game.c
@@ -10156,8 +10156,9 @@ CLEAN_DIRECTORY:
     }
 
     for (i=0; i < g_defModulesNum; ++i)
-        Bfree (g_defModules[i]);
-    Bfree (g_defModules);
+        Bfree(g_defModules[i]);
+    Bfree(g_defModules);
+    g_defModules = NULL;
 
     if (numplayers == 1 && boardfilename[0] != 0)
     {
diff --git a/polymer/eduke32/source/gamedef.c b/polymer/eduke32/source/gamedef.c
index b45d4e853..184ccb126 100644
--- a/polymer/eduke32/source/gamedef.c
+++ b/polymer/eduke32/source/gamedef.c
@@ -5799,6 +5799,7 @@ void C_Compile(const char *filenam)
         Bfree(g_scriptModules[i]);
     }
     Bfree(g_scriptModules);
+    g_scriptModules = NULL;
 
     flushlogwindow = 1;
 
diff --git a/polymer/eduke32/source/premap.c b/polymer/eduke32/source/premap.c
index 3b8400031..5a36e1205 100644
--- a/polymer/eduke32/source/premap.c
+++ b/polymer/eduke32/source/premap.c
@@ -1309,10 +1309,11 @@ static inline void prelevel(char g)
         {
             j = wal->nextsector;
 
-            if (g_mirrorCount > 63)
-                G_GameExit("\nToo many mirrors (64 max.)");
             if ((j >= 0) && sector[j].ceilingpicnum != MIRROR)
             {
+                if (g_mirrorCount > 63)
+                    G_GameExit("\nToo many mirrors (64 max.)");
+
                 sector[j].ceilingpicnum = MIRROR;
                 sector[j].floorpicnum = MIRROR;
                 g_mirrorWall[g_mirrorCount] = i;