fix: resolve NPE while compare outer generic types

jadx-core/src/main/java/jadx/core/dex/visitors/typeinference/TypeCompare.java

@@ -174,15 +174,24 @@ public class TypeCompare {
 				// both wildcards
 				return compareWildcardTypes(first, second);
 			}
-			// compare generics arrays
 			ArgType[] firstGenericTypes = first.getGenericTypes();
 			ArgType[] secondGenericTypes = second.getGenericTypes();
-			int len = firstGenericTypes.length;
-			if (len == secondGenericTypes.length) {
-				for (int i = 0; i < len; i++) {
-					TypeCompareEnum res = compareTypes(firstGenericTypes[i], secondGenericTypes[i]);
-					if (res != EQUAL) {
-						return res;
+			if (firstGenericTypes == null || secondGenericTypes == null) {
+				// check outer types
+				ArgType firstOuterType = first.getOuterType();
+				ArgType secondOuterType = second.getOuterType();
+				if (firstOuterType != null && secondOuterType != null) {
+					return compareTypes(firstOuterType, secondOuterType);
+				}
+			} else {
+				// compare generics arrays
+				int len = firstGenericTypes.length;
+				if (len == secondGenericTypes.length) {
+					for (int i = 0; i < len; i++) {
+						TypeCompareEnum res = compareTypes(firstGenericTypes[i], secondGenericTypes[i]);
+						if (res != EQUAL) {
+							return res;
+						}
 					}
 				}
 			}

jadx-core/src/test/java/jadx/core/dex/visitors/typeinference/TypeCompareTest.java

@@ -155,6 +155,16 @@ public class TypeCompareTest {
 		check(vType, ArgType.STRING, TypeCompareEnum.CONFLICT);
 	}
 
+	@Test
+	public void compareOuterGenerics() {
+		ArgType hashMapType = object("java.util.HashMap");
+		ArgType innerEntrySetType = object("EntrySet");
+		ArgType firstInstance = ArgType.outerGeneric(generic(hashMapType, STRING, STRING), innerEntrySetType);
+		ArgType secondInstance = ArgType.outerGeneric(generic(hashMapType, OBJECT, OBJECT), innerEntrySetType);
+
+		check(firstInstance, secondInstance, TypeCompareEnum.NARROW);
+	}
+
 	private void firstIsNarrow(ArgType first, ArgType second) {
 		check(first, second, TypeCompareEnum.NARROW);
 	}