diff --git a/src/pokemon.c b/src/pokemon.c
index 8e8166fb3..7d121289e 100644
--- a/src/pokemon.c
+++ b/src/pokemon.c
@@ -8621,6 +8621,8 @@ void TrySpecialOverworldEvo(void)
 
 bool32 ShouldShowFemaleDifferences(u16 species, u32 personality)
 {
+    if (species >= NUM_SPECIES)
+        return FALSE;
     return (gSpeciesInfo[species].flags & SPECIES_FLAG_GENDER_DIFFERENCE) && GetGenderFromSpeciesAndPersonality(species, personality) == MON_FEMALE;
 }