diff --git a/docs/pybullet_quickstartguide.pdf b/docs/pybullet_quickstartguide.pdf
index 2e398cb0c..e4d591cec 100644
Binary files a/docs/pybullet_quickstartguide.pdf and b/docs/pybullet_quickstartguide.pdf differ
diff --git a/setup.py b/setup.py
index 86718314f..6d79f6988 100644
--- a/setup.py
+++ b/setup.py
@@ -491,7 +491,7 @@ if 'BT_USE_EGL' in EGL_CXX_FLAGS:
 
 setup(
     name='pybullet',
-    version='2.6.0',
+    version='2.6.1',
     description=
     'Official Python Interface for the Bullet Physics SDK specialized for Robotics Simulation and Reinforcement Learning',
     long_description=
diff --git a/src/BulletSoftBody/btDeformableMultiBodyDynamicsWorld.cpp b/src/BulletSoftBody/btDeformableMultiBodyDynamicsWorld.cpp
index 618e5c0d7..af6f9806c 100644
--- a/src/BulletSoftBody/btDeformableMultiBodyDynamicsWorld.cpp
+++ b/src/BulletSoftBody/btDeformableMultiBodyDynamicsWorld.cpp
@@ -66,6 +66,11 @@ m_deformableBodySolver(deformableBodySolver), m_solverCallback(0)
 	m_solverDeformableBodyIslandCallback = new DeformableBodyInplaceSolverIslandCallback(constraintSolver, dispatcher);
 }
 
+btDeformableMultiBodyDynamicsWorld::~btDeformableMultiBodyDynamicsWorld()
+{
+    delete m_solverDeformableBodyIslandCallback;
+}
+
 void btDeformableMultiBodyDynamicsWorld::internalSingleStepSimulation(btScalar timeStep)
 {
     BT_PROFILE("internalSingleStepSimulation");
diff --git a/src/BulletSoftBody/btDeformableMultiBodyDynamicsWorld.h b/src/BulletSoftBody/btDeformableMultiBodyDynamicsWorld.h
index 763038576..a1ed4d1d9 100644
--- a/src/BulletSoftBody/btDeformableMultiBodyDynamicsWorld.h
+++ b/src/BulletSoftBody/btDeformableMultiBodyDynamicsWorld.h
@@ -80,9 +80,7 @@ public:
         m_solverCallback = cb;
     }
     
-    virtual ~btDeformableMultiBodyDynamicsWorld()
-    {
-    }
+    virtual ~btDeformableMultiBodyDynamicsWorld();
     
     virtual btMultiBodyDynamicsWorld* getMultiBodyDynamicsWorld()
     {