TWRP stuck on booting - because sd card

Hello everyone,
the following happend:

• everything was ok
• bought a sdcard, inserted and cm ask how i want to use it, i selected: use as internal memory (cm moved 17 gb to it)
• want to boot to twrp, and get stuck at twrp logo, every time i try
• removed sdcard and retry.... it works :eek:

My stats:

• Device: d855
• OS: CM13 (A6.0.1)
• Default Kernel
• TWRP: 3.0.0
• SD Card: Samsung 64gb

What i tried:

• reflash twrp (not solved the problem)
• boot to twrp without sd, then inserted sd, and tried to mount .... cannot mount :/

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