diff --git a/src/main/java/net/fabricmc/loom/configuration/ide/RunConfig.java b/src/main/java/net/fabricmc/loom/configuration/ide/RunConfig.java
index 5af0a7b3..7f3ba731 100644
--- a/src/main/java/net/fabricmc/loom/configuration/ide/RunConfig.java
+++ b/src/main/java/net/fabricmc/loom/configuration/ide/RunConfig.java
@@ -159,7 +159,7 @@ public class RunConfig {
 
 		if (extension.getLoaderLaunchMethod().equals("launchwrapper")) {
 			// if installer.json found...
-			JsonObject installerJson = extension.getInstallerData().installerJson();
+			JsonObject installerJson = extension.getInstallerData() == null ? null : extension.getInstallerData().installerJson();
 
 			if (installerJson != null) {
 				List<String> sideKeys = ImmutableList.of(environment, "common");
@@ -306,7 +306,7 @@ public class RunConfig {
 	}
 
 	private static String getMainClass(String side, LoomGradleExtension extension, String defaultMainClass) {
-		JsonObject installerJson = extension.getInstallerData().installerJson();
+		JsonObject installerJson = extension.getInstallerData() == null ? null : extension.getInstallerData().installerJson();
 
 		if (installerJson != null && installerJson.has("mainClass")) {
 			JsonElement mainClassJson = installerJson.get("mainClass");