diff --git a/src/battle_intro.c b/src/battle_intro.c
index 8a335ea481..ebc737dac1 100644
--- a/src/battle_intro.c
+++ b/src/battle_intro.c
@@ -125,7 +125,8 @@ void HandleIntroSlide(u8 environment)
     }
     else
     {
-        if (environment >= NELEMS(sBattleIntroSlideFuncs))
+        if (environment >= NELEMS(sBattleIntroSlideFuncs)
+         || sBattleIntroSlideFuncs[environment] == NULL)
             environment = BATTLE_ENVIRONMENT_PLAIN;
         taskId = CreateTask(sBattleIntroSlideFuncs[environment], 0);
     }