diff --git a/src/main/kotlin/app/revanced/patcher/Patcher.kt b/src/main/kotlin/app/revanced/patcher/Patcher.kt
index 4c31e8a..1e7433d 100644
--- a/src/main/kotlin/app/revanced/patcher/Patcher.kt
+++ b/src/main/kotlin/app/revanced/patcher/Patcher.kt
@@ -48,6 +48,8 @@ class Patcher(
                     // TODO: Use logger and warn about duplicate classes
                     if (throwOnDuplicates)
                         throw Exception("Class ${classDef.type} has already been added to the patcher.")
+
+                    continue
                 }
                 cache.classes.add(classDef)
             }