diff --git a/src/main/java/net/fabricmc/loom/configuration/ifaceinject/InterfaceInjectionProcessor.java b/src/main/java/net/fabricmc/loom/configuration/ifaceinject/InterfaceInjectionProcessor.java
index 3ef529ab..85c0f83d 100644
--- a/src/main/java/net/fabricmc/loom/configuration/ifaceinject/InterfaceInjectionProcessor.java
+++ b/src/main/java/net/fabricmc/loom/configuration/ifaceinject/InterfaceInjectionProcessor.java
@@ -205,6 +205,10 @@ public class InterfaceInjectionProcessor implements JarProcessor, GenerateSource
 			throw new UncheckedIOException(e);
 		}
 
+		if (fabricModJson == null) {
+			return Collections.emptyList();
+		}
+
 		return InjectedInterface.fromFabricModJson(fabricModJson);
 	}