5.5.4 update causes WP editor to crash

I recently took the 5.5.4 update and now when I edit a post, the screen renders blank and the console shows the error below. The problem only seems to be in edit mode using the default (Gutenberg) editor.

When I deactivate Contact Form 7, the error goes away. I tried multiple browsers & cleared cache.

I’m using the Bravada theme.

Any help is appreciated, thanks!

react-dom.min.js?ver=17.0.1:141 TypeError: Cannot read properties of undefined (reading '0')
    at save (index.js?ver=5.5.4:1:4122)
    at yt (blocks.min.js?ver=28…51927067812:2:27409)
    at wt (blocks.min.js?ver=28…51927067812:2:27802)
    at blocks.min.js?ver=28…51927067812:2:54385
    at Br (blocks.min.js?ver=28…51927067812:2:54531)
    at Nr (blocks.min.js?ver=28…51927067812:2:55473)
    at blocks.min.js?ver=28…51927067812:2:56486
    at Array.reduce (<anonymous>)
    at Ar (blocks.min.js?ver=28…51927067812:2:56463)
    at core-data.min.js?ver…74414ad5a54:2:44258
Ye	@	react-dom.min.js?ver=17.0.1:141
Mh.c.callback	@	react-dom.min.js?ver=17.0.1:141
dh	@	react-dom.min.js?ver=17.0.1:80
Bj	@	react-dom.min.js?ver=17.0.1:145
Qj	@	react-dom.min.js?ver=17.0.1:176
unstable_runWithPriority	@	react.min.js?ver=17.0.1:24
Za	@	react-dom.min.js?ver=17.0.1:73
eb	@	react-dom.min.js?ver=17.0.1:170
gf	@	react-dom.min.js?ver=17.0.1:162
(anonymous)	@	react-dom.min.js?ver=17.0.1:73
unstable_runWithPriority	@	react.min.js?ver=17.0.1:24
Za	@	react-dom.min.js?ver=17.0.1:73
$g	@	react-dom.min.js?ver=17.0.1:73
ja	@	react-dom.min.js?ver=17.0.1:73
Pa	@	react-dom.min.js?ver=17.0.1:157
Me	@	react-dom.min.js?ver=17.0.1:110
e	@	data.min.js?ver=c5f9…9d870764c8fc1dd1b:2
t	@	data.min.js?ver=c5f9…9d870764c8fc1dd1b:2
(anonymous)	@	data.min.js?ver=c5f9…9d870764c8fc1dd1b:2
(anonymous)	@	data.min.js?ver=c5f9…9d870764c8fc1dd1b:2
b	@	data.min.js?ver=c5f9…9d870764c8fc1dd1b:2
(anonymous)	@	data.min.js?ver=c5f9…9d870764c8fc1dd1b:2
(anonymous)	@	redux-routine.min.js…6f62731e018a4449e:2
(anonymous)	@	data.min.js?ver=c5f9…9d870764c8fc1dd1b:2
(anonymous)	@	data.min.js?ver=c5f9…9d870764c8fc1dd1b:2
(anonymous)	@	data.min.js?ver=c5f9…9d870764c8fc1dd1b:2
(anonymous)	@	core-data.min.js?ver…8ab7fa74414ad5a54:2
await in (anonymous) (async)		
(anonymous)	@	data.min.js?ver=c5f9…9d870764c8fc1dd1b:2
(anonymous)	@	redux-routine.min.js…6f62731e018a4449e:2
(anonymous)	@	data.min.js?ver=c5f9…9d870764c8fc1dd1b:2
(anonymous)	@	data.min.js?ver=c5f9…9d870764c8fc1dd1b:2
Q	@	data.min.js?ver=c5f9…9d870764c8fc1dd1b:2
(anonymous)	@	data.min.js?ver=c5f9…9d870764c8fc1dd1b:2
setTimeout (async)		
a	@	data.min.js?ver=c5f9…9d870764c8fc1dd1b:2
u	@	data.min.js?ver=c5f9…9d870764c8fc1dd1b:2
(anonymous)	@	edit-post.min.js?ver…48f452da0da95d621:7
(anonymous)	@	data.min.js?ver=c5f9…9d870764c8fc1dd1b:2
a	@	data.min.js?ver=c5f9…9d870764c8fc1dd1b:2
(anonymous)	@	data.min.js?ver=c5f9…9d870764c8fc1dd1b:2
(anonymous)	@	data.min.js?ver=c5f9…9d870764c8fc1dd1b:2
xe	@	data.min.js?ver=c5f9…9d870764c8fc1dd1b:2
zt	@	edit-post.min.js?ver…48f452da0da95d621:7
Le	@	react-dom.min.js?ver=17.0.1:100
Pj	@	react-dom.min.js?ver=17.0.1:231
di	@	react-dom.min.js?ver=17.0.1:168
Nj	@	react-dom.min.js?ver=17.0.1:168
sc	@	react-dom.min.js?ver=17.0.1:168
gf	@	react-dom.min.js?ver=17.0.1:162
Pa	@	react-dom.min.js?ver=17.0.1:157
yd	@	react-dom.min.js?ver=17.0.1:188
(anonymous)	@	react-dom.min.js?ver=17.0.1:191
bi	@	react-dom.min.js?ver=17.0.1:163
zd	@	react-dom.min.js?ver=17.0.1:191
M.render	@	react-dom.min.js?ver=17.0.1:243
Qt	@	edit-post.min.js?ver…48f452da0da95d621:7
(anonymous)	@	post.php?post=7707&action=edit:468

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