diff --git a/testable-core/src/main/java/com/alibaba/testable/core/util/InvokeRecordUtil.java b/testable-core/src/main/java/com/alibaba/testable/core/util/InvokeRecordUtil.java
index 0ec0b27..1b82827 100644
--- a/testable-core/src/main/java/com/alibaba/testable/core/util/InvokeRecordUtil.java
+++ b/testable-core/src/main/java/com/alibaba/testable/core/util/InvokeRecordUtil.java
@@ -22,6 +22,10 @@ public class InvokeRecordUtil {
         StackTraceElement mockMethodTraceElement = Thread.currentThread().getStackTrace()[INDEX_OF_TEST_CLASS];
         String mockMethodName = mockMethodTraceElement.getMethodName();
         MockContext mockContext = MockContextUtil.context.get();
+        if (mockContext == null) {
+            // mock method not invoked from test case, e.g. in static block
+            return;
+        }
         String testClass = mockContext.testClassName;
         String testCaseName = mockContext.testCaseName;
         if (isConstructor) {
diff --git a/testable-core/src/main/java/com/alibaba/testable/core/util/MockContextUtil.java b/testable-core/src/main/java/com/alibaba/testable/core/util/MockContextUtil.java
index 7b0571f..c9855dc 100644
--- a/testable-core/src/main/java/com/alibaba/testable/core/util/MockContextUtil.java
+++ b/testable-core/src/main/java/com/alibaba/testable/core/util/MockContextUtil.java
@@ -36,7 +36,8 @@ public class MockContextUtil {
     }
 
     public static Map<String, Object> parameters() {
-        return MockContextUtil.context.get().parameters;
+        MockContext mockContext = MockContextUtil.context.get();
+        return mockContext == null ? new HashMap<String, Object>() : mockContext.parameters;
     }
 
 }