diff --git a/src/d_player.h b/src/d_player.h
index c8c5b0fc7..80ac8c870 100644
--- a/src/d_player.h
+++ b/src/d_player.h
@@ -510,7 +510,7 @@ public:
 			crouchdir = 0;
 			crouching = 0;
 			crouchviewdelta = 0;
-			viewheight = mo->ViewHeight;
+			viewheight = mo ? mo->ViewHeight : 0;
 		}
 	}