1 files changed, 2 insertions, 1 deletions
diff --git a/spark-fabric/src/main/java/me/lucko/spark/fabric/FabricClassSourceLookup.java b/spark-fabric/src/main/java/me/lucko/spark/fabric/FabricClassSourceLookup.java
index 0ad05b9..ef22d9c 100644
--- a/spark-fabric/src/main/java/me/lucko/spark/fabric/FabricClassSourceLookup.java
+++ b/spark-fabric/src/main/java/me/lucko/spark/fabric/FabricClassSourceLookup.java
@@ -142,7 +142,8 @@ public class FabricClassSourceLookup extends ClassSourceLookup.ByCodeSource {
     private static String modIdFromMixinClass(String mixinClassName) {
         for (Config config : MixinUtils.getMixinConfigs().values()) {
             IMixinConfig mixinConfig = config.getConfig();
-            if (mixinClassName.startsWith(mixinConfig.getMixinPackage())) {
+            String mixinPackage = mixinConfig.getMixinPackage();
+            if (!mixinPackage.isEmpty() && mixinClassName.startsWith(mixinPackage)) {
                 return mixinConfig.getDecoration(FabricUtil.KEY_MOD_ID);
             }
         }