diff -r 356c8fb7fb56 -r 8ad21fe5d062 hedgewars/uGearsHandlersMess.pas
--- a/hedgewars/uGearsHandlersMess.pas	Thu May 21 18:21:55 2015 +0900
+++ b/hedgewars/uGearsHandlersMess.pas	Fri May 22 13:39:12 2015 -0400
@@ -1929,7 +1929,8 @@
                 Gear^.State:= Gear^.State and (not gstAttacking);
                 Gear^.Timer:= Gear^.WDTimer
                 end;
-            dec(Gear^.Timer);
+            if Gear^.Timer > 0 then
+                dec(Gear^.Timer);
             end
         end
     else // gsttmpFlag = 0