diff --git a/src/m_cond.c b/src/m_cond.c
index cf10e499b..8730e28b4 100644
--- a/src/m_cond.c
+++ b/src/m_cond.c
@@ -999,7 +999,8 @@ UINT8 M_CompletionEmblems(void) // Bah! Duplication sucks, but it's for a separa
 
 boolean M_CheckNetUnlockByID(UINT8 unlockid)
 {
-	if (unlockid >= MAXUNLOCKABLES)
+	if (unlockid >= MAXUNLOCKABLES
+		|| !unlockables[unlockid].conditionset)
 	{
 		return true; // default permit
 	}