X-Git-Url: https://git.sesse.net/?a=blobdiff_plain;f=theme.cpp;h=1d0cd2d643db006a4fae075f8aed7c817e5e176f;hb=c6af897e02de1e5653de71fc4993449e828bb94f;hp=a5f8cfbba6c1d38e3b1cd0a4514567323ad4f239;hpb=6f8690087b69b42a1d21d783d6cf60bcd8e9f1d3;p=nageru

diff --git a/theme.cpp b/theme.cpp
index a5f8cfb..1d0cd2d 100644
--- a/theme.cpp
+++ b/theme.cpp
@@ -761,7 +761,12 @@ Theme::Chain Theme::get_chain(unsigned num, float t, unsigned width, unsigned he
 		exit(1);
 	}
 
-	chain.chain = (EffectChain *)luaL_checkudata(L, -2, "EffectChain");
+	chain.chain = (EffectChain *)luaL_testudata(L, -2, "EffectChain");
+	if (chain.chain == nullptr) {
+		fprintf(stderr, "get_chain() for chain number %d did not return an EffectChain\n",
+			num);
+		exit(1);
+	}
 	if (!lua_isfunction(L, -1)) {
 		fprintf(stderr, "Argument #-1 should be a function\n");
 		exit(1);