Sprite Kit Physics Assertion failed: (typeA == b2_

Question

I am trying to make a game with fully IOS 7 features using SpriteKit including Physics. So when user tabs to the screen, I am throwing a ball through some other balls (which are not moving and I set dynamic=NO for these target balls). What I want to do is:

• Immadiately stop the ball (I am using resting=YES for this)
• Switching categoryBitMask and contactTestBit mask from throwing ball to target ball's category / contactBitMask
• Stopping dynamics for this ball.

Everything is okay except one thing, when I am setting dynamic=NO inside didBeginContact (even any other functions like update or didSimulatePhysics) getting following error:

Assertion failed: (typeA == b2_dynamicBody || typeB == b2_dynamicBody), function SolveTOI, file /SourceCache/PhysicsKit_Sim/PhysicsKit-4.6/PhysicsKit/Box2D/Dynamics/b2World.cpp, line 670.

Alright I understand the reason 'cause calculations are still continuing about physics but somehow I have to set this.

So how can I stop dynamics programatically after collision / contact?