Prevent segfault, water_damage may get a NULL obj

diff --git a/src/trap.c b/src/trap.c
index 36c1ee632c78c0922a70fed64cd36e89dacd902e..bc8f0c7466895006f31164a0c5679a889b58b78d 100644 (file)
--- a/src/trap.c
+++ b/src/trap.c
@@ -3159,6 +3159,8 @@ boolean force;
 {
        boolean exploded = FALSE;
 
+       if (!obj) return ER_NOTHING;
+
         if (snuff_lit(obj))
             return ER_DAMAGED;