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 "electrum\gui\qt\swap_dialog.py", line 152, in on_send_edited
  File "electrum\submarine_swaps.py", line 524, in get_recv_amount

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
4.1.4	3.8.8 (tags/v3.8.8:024d805, Feb 19 2021, 13:08:11) [MSC v.1928 32 bit (Intel)]	Windows-10-10.0.22000-SP0	standard	en_US	ℹ
4.1.5	3.7.10 (default, Jun 28 2018, 19:01:02) [GCC 5.4.0 20160609]	Linux-5.4.0-81-generic-x86_64-with-debian-bullseye-sid	standard	en_US	ℹ
4.2.1	3.8.10 (default, Nov 26 2021, 20:14:08) [GCC 9.3.0]	Linux-5.4.0-104-generic-x86_64-with-glibc2.29	standard	en_US	ℹ
4.2.1	3.9.2 (default, Feb 28 2021, 17:03:44) [GCC 10.2.1 20210110]	Linux-5.16.0-12parrot1-amd64-x86_64-with-glibc2.31	standard	en_US	ℹ
4.2.1	3.9.11 (tags/v3.9.11:2de452f, Mar 16 2022, 14:21:37) [MSC v.1929 32 bit (Intel)]	Windows-10-10.0.22000-SP0	standard	en_US	ℹ
4.2.1	3.9.11 (tags/v3.9.11:2de452f, Mar 16 2022, 14:21:37) [MSC v.1929 32 bit (Intel)]	Windows-10-10.0.22000-SP0	standard	en_US	ℹ
4.2.2	3.9.11 (v3.9.11:2de452f8bf, Mar 16 2022, 10:34:36) [Clang 6.0 (clang-600.0.57)]	macOS-10.16-x86_64-i386-64bit	standard	?	ℹ

Additional Information

The reporting user(s) did not provide additional information.