Find Usages: Fix exception in the search of class with default parameters in primary constructor

idea/src/org/jetbrains/kotlin/idea/findUsages/handlers/KotlinFindClassUsagesHandler.kt

@@ -43,6 +43,7 @@ import com.intellij.find.findUsages.JavaFindUsagesHandlerFactory
 import com.intellij.psi.PsiMethod
 import com.intellij.psi.search.searches.MethodReferencesSearch
 import com.intellij.util.CommonProcessors
+import org.jetbrains.kotlin.asJava.KotlinLightMethod
 import org.jetbrains.kotlin.asJava.toLightClass
 import org.jetbrains.kotlin.idea.search.usagesSearch.processDelegationCallConstructorUsages
 
@@ -93,6 +94,7 @@ public class KotlinFindClassUsagesHandler(
             if (kotlinOptions.searchConstructorUsages) {
                 val constructors = classOrObject.toLightClass()?.getConstructors() ?: PsiMethod.EMPTY_ARRAY
                 for (constructor in constructors) {
+                    if (constructor !is KotlinLightMethod) continue
                     constructor.processDelegationCallConstructorUsages(constructor.getUseScope()) {
                         it.getCalleeExpression()?.getReference()?.let { KotlinFindUsagesHandler.processUsage(uniqueProcessor, it) }
                     }

idea/testData/findUsages/kotlin/findClassUsages/primaryConstructorWithDefaultParams.0.kt

@@ -0,0 +1,8 @@
+// PSI_ELEMENT: org.jetbrains.kotlin.psi.JetClass
+// OPTIONS: usages, constructorUsages
+class <caret>A(a: Int = 1)
+
+fun test() {
+    A(0)
+    A()
+}

idea/testData/findUsages/kotlin/findClassUsages/primaryConstructorWithDefaultParams.results.txt

@@ -0,0 +1,2 @@
+New instance creation (6: 5) A(0)
+New instance creation (7: 5) A()

idea/tests/org/jetbrains/kotlin/findUsages/JetFindUsagesTestGenerated.java

@@ -527,6 +527,12 @@ public class JetFindUsagesTestGenerated extends AbstractJetFindUsagesTest {
                 String fileName = JetTestUtils.navigationMetadata("idea/testData/findUsages/kotlin/findClassUsages/kotlinTraitDerivedTraits.0.kt");
                 doTest(fileName);
             }
+
+            @TestMetadata("primaryConstructorWithDefaultParams.0.kt")
+            public void testPrimaryConstructorWithDefaultParams() throws Exception {
+                String fileName = JetTestUtils.navigationMetadata("idea/testData/findUsages/kotlin/findClassUsages/primaryConstructorWithDefaultParams.0.kt");
+                doTest(fileName);
+            }
         }
 
         @TestMetadata("idea/testData/findUsages/kotlin/findFunctionUsages")