diff --git a/CHANGELOG.md b/CHANGELOG.md
index 56253e8..f9c64a3 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,8 @@
 # jnitrace Change Log
 
+## 1.3.3
+- Bug fix - Checked whether the this context exists before using it
+
 ## 1.3.2
 - Bug fix - Use Process.findRangeByAddress instead of Process.findModuleByAddress for checking the validity of the stack pointer
 
diff --git a/jnitrace/src/jni/jni_env_interceptor.js b/jnitrace/src/jni/jni_env_interceptor.js
index 2341051..9cc222e 100644
--- a/jnitrace/src/jni/jni_env_interceptor.js
+++ b/jnitrace/src/jni/jni_env_interceptor.js
@@ -37,9 +37,13 @@ JNIEnvInterceptor.prototype.createJNIIntercept = function(id, methodAddr) {
 
   var nativeFunction = new NativeFunction(methodAddr, fridaRet, fridaArgs);
   var nativeCallback = new NativeCallback(function() {
-    var threadId = this.threadId;
+    var threadId = Process.getCurrentThreadId();
     var localArgs = [].slice.call(arguments);
     var jniEnv = self.threads.getJNIEnv(threadId);
+    var context = null;
+    if (this) {
+      context = this.context;
+    }
 
     localArgs[0] = jniEnv;
 
@@ -62,7 +66,7 @@ JNIEnvInterceptor.prototype.createJNIIntercept = function(id, methodAddr) {
       }
     }
 
-    self.transport.trace(method, localArgs, ret, this.context, add);
+    self.transport.trace(method, localArgs, ret, context, add);
 
     if (method.name === "GetMethodID" ||
         method.name === "GetStaticMethodID") {
diff --git a/setup.py b/setup.py
index f5ddb15..0a78f0a 100644
--- a/setup.py
+++ b/setup.py
@@ -8,7 +8,7 @@
 
 setup(
     name='jnitrace',
-    version='1.3.2',
+    version='1.3.3',
     description='A tool for tracing use of the JNI in Android apps',
     long_description=long_description,
     long_description_content_type='text/markdown',