ph1lm

I have this same error.
The filename is wp-content/languages/wpml/wordpress-ja.mo
and the value is zero

Not sure how to show you this file!
The content of the file is this hex:

DE 12 04 95 00 00 00 00 07 00 00 00 1C 00 00 00 54 00 00 00 00 00 00 00 8C 00 00 00 00 00 00 00 8C 00 00 00 18 00 00 00 8D 00 00 00 18 00 00 00 A6 00 00 00 11 00 00 00 BF 00 00 00 07 00 00 00 D1 00 00 00 10 00 00 00 D9 00 00 00 0B 00 00 00 EA 00 00 00 00 00 00 00 F6 00 00 00 10 00 00 00 F7 00 00 00 0B 00 00 00 08 01 00 00 07 00 00 00 14 01 00 00 07 00 00 00 1C 01 00 00 10 00 00 00 24 01 00 00 0B 00 00 00 35 01 00 00 00 55 52 4C 20 70 72 6F 64 75 63 74 5F 63 61 74 20 74 61 78 20 73 6C 75 67 00 55 52 4C 20 70 72 6F 64 75 63 74 5F 74 61 67 20 74 61 78 20 73 6C 75 67 00 55 52 4C 20 73 6C 75 67 3A 20 70 72 6F 64 75 63 74 00 70 72 6F 64 75 63 74 00 70 72 6F 64 75 63 74 2D 63 61 74 65 67 6F 72 79 00 70 72 6F 64 75 63 74 2D 74 61 67 00 00 70 72 6F 64 75 63 74 2D 63 61 74 65 67 6F 72 79 00 70 72 6F 64 75 63 74 2D 74 61 67 00 70 72 6F 64 75 63 74 00 70 72 6F 64 75 63 74 00 70 72 6F 64 75 63 74 2D 63 61 74 65 67 6F 72 79 00 70 72 6F 64 75 63 74 2D 74 61 67 00

I have another site that uses en_GB lanaguage, so uses MO files, but NOT WPML. It does use Query Monitor.
In output/html/overview.php line 374 I get the same sprintf() fatal error.
The fix for cached values I used above does not work, I needed a similar fix for “\0” translations at line 137 to catch the non-cached translations.

esc_html__( ‘%s S’, ‘query-monitor’ ) was returning BOTH singular AND pural translations which is WRONG (esc_html__ calls ->translate)