TypeError: unsupported operand type(s) for -: 'int' and 'NoneType'

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Crash Report

This crash report was reported through the automatic crash reporting system 🤖

Traceback

  File "site-packages\electrum-3.1.3-py3.5.egg\electrum_gui\qt\main_window.py", line 3111, in f

TypeError: unsupported operand type(s) for -: 'int' and 'NoneType'

Reporter

This issue was reported by 7 user(s):

Electrum Version	Python Version	Operating System	Wallet Type	Locale	Stack
3.1.3		Windows-7-6.1.7601-SP1	standard	ru_RU	ℹ
3.1.3		Windows-10-10.0.16299-SP0	standard	en_US	ℹ
3.2.3	3.6.4 (default, Feb 28 2018, 03:24:19) [GCC 4.2.1 Compatible Apple LLVM 8.0.0 (clang-800.0.42.1)]	Darwin-17.7.0-x86_64-i386-64bit	standard	?	ℹ
3.2.3	3.6.6 (v3.6.6:4cf1f54eb7, Jun 27 2018, 02:47:15) [MSC v.1900 32 bit (Intel)]	Windows-7-6.1.7601-SP1	standard	pl_PL	ℹ
3.2.3	3.5.2 (default, Nov 12 2018, 13:43:14) [GCC 5.4.0 20160609]	Linux-4.15.0-43-generic-x86_64-with-LinuxMint-18.3-sylvia	standard	en_US	ℹ
3.2.2		Windows-8.1-6.3.9600-SP0	standard	en_US	ℹ
3.1.2		Windows-10-10.0.18362-SP0	standard	en_US	ℹ

Additional Information

"cut" the proposed fee size to see how much that was worth from the CPFP screen

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