diff --git a/base-test/org.eclipse.jdt.groovy.core.tests.compiler/src/org/eclipse/jdt/groovy/core/tests/xform/TypeCheckedTests.java b/base-test/org.eclipse.jdt.groovy.core.tests.compiler/src/org/eclipse/jdt/groovy/core/tests/xform/TypeCheckedTests.java
index 4cefd28009..b0f3251e8f 100644
--- a/base-test/org.eclipse.jdt.groovy.core.tests.compiler/src/org/eclipse/jdt/groovy/core/tests/xform/TypeCheckedTests.java
+++ b/base-test/org.eclipse.jdt.groovy.core.tests.compiler/src/org/eclipse/jdt/groovy/core/tests/xform/TypeCheckedTests.java
@@ -4294,4 +4294,29 @@ public void testTypeChecked10327() {
 
         runConformTest(sources);
     }
+
+    @Test
+    public void testTypeChecked10330() {
+        if (Float.parseFloat(System.getProperty("java.specification.version")) > 8)
+            vmArguments = new String[] {"--add-opens", "java.base/java.util.function=ALL-UNNAMED"};
+
+        //@formatter:off
+        String[] sources = {
+            "Main.groovy",
+            "@groovy.transform.TypeChecked\n" +
+            "class C<T> {\n" +
+            "  T y\n" +
+            "  void m(T x, java.util.function.Function<T, T> f) {\n" +
+            "    print f.apply(x)\n" +
+            "  }\n" +
+            "  void test(T x, java.util.function.Function<T, T> f) {\n" +
+            "    m(true ? x : y, f)\n" +
+            "  }\n" +
+            "}\n" +
+            "new C<String>().test('WORKS', { it.toLowerCase() })\n",
+        };
+        //@formatter:on
+
+        runConformTest(sources, "works");
+    }
 }
diff --git a/base/org.codehaus.groovy25/src/org/codehaus/groovy/ast/tools/WideningCategories.java b/base/org.codehaus.groovy25/src/org/codehaus/groovy/ast/tools/WideningCategories.java
index 794d1de833..c39d5a1d07 100644
--- a/base/org.codehaus.groovy25/src/org/codehaus/groovy/ast/tools/WideningCategories.java
+++ b/base/org.codehaus.groovy25/src/org/codehaus/groovy/ast/tools/WideningCategories.java
@@ -209,6 +209,9 @@ public static ClassNode lowestUpperBound(List<ClassNode> nodes) {
     public static ClassNode lowestUpperBound(ClassNode a, ClassNode b) {
         ClassNode lub = lowestUpperBound(a, b, null, null);
         if (lub==null || !lub.isUsingGenerics()) return lub;
+        // GRECLIPSE add -- GROOVY-10130
+        if (lub.isGenericsPlaceHolder()) return lub;
+        // GRECLIPSE end
         // types may be parameterized. If so, we must ensure that generic type arguments
         // are made compatible
 
diff --git a/base/org.codehaus.groovy30/src/org/codehaus/groovy/ast/tools/WideningCategories.java b/base/org.codehaus.groovy30/src/org/codehaus/groovy/ast/tools/WideningCategories.java
index e367d1eb4f..3655982db1 100644
--- a/base/org.codehaus.groovy30/src/org/codehaus/groovy/ast/tools/WideningCategories.java
+++ b/base/org.codehaus.groovy30/src/org/codehaus/groovy/ast/tools/WideningCategories.java
@@ -207,6 +207,9 @@ public static ClassNode lowestUpperBound(List<ClassNode> nodes) {
     public static ClassNode lowestUpperBound(ClassNode a, ClassNode b) {
         ClassNode lub = lowestUpperBound(a, b, null, null);
         if (lub==null || !lub.isUsingGenerics()) return lub;
+        // GRECLIPSE add -- GROOVY-10130
+        if (lub.isGenericsPlaceHolder()) return lub;
+        // GRECLIPSE end
         // types may be parameterized. If so, we must ensure that generic type arguments
         // are made compatible
 
diff --git a/base/org.codehaus.groovy40/src/org/codehaus/groovy/ast/tools/WideningCategories.java b/base/org.codehaus.groovy40/src/org/codehaus/groovy/ast/tools/WideningCategories.java
index 687af0af98..5e9d8d4b54 100644
--- a/base/org.codehaus.groovy40/src/org/codehaus/groovy/ast/tools/WideningCategories.java
+++ b/base/org.codehaus.groovy40/src/org/codehaus/groovy/ast/tools/WideningCategories.java
@@ -213,10 +213,12 @@ public static ClassNode lowestUpperBound(final List<ClassNode> nodes) {
      */
     public static ClassNode lowestUpperBound(final ClassNode a, final ClassNode b) {
         ClassNode lub = lowestUpperBound(a, b, null, null);
-        if (lub==null || !lub.isUsingGenerics()) return lub;
-        // types may be parameterized. If so, we must ensure that generic type arguments
+        if (lub == null || !lub.isUsingGenerics()
+                || lub.isGenericsPlaceHolder()) { // GROOVY-10330
+            return lub;
+        }
+        // types may be parameterized; if so, ensure that generic type arguments
         // are made compatible
-
         if (lub instanceof LowestUpperBoundClassNode) {
             // no parent super class representing both types could be found
             // or both class nodes implement common interfaces which may have