Database error

From Marteau

A database query syntax error has occurred. This may indicate a bug in the software. The last attempted database query was:
(SQL query hidden)
from within function "LinkCache::addLinkObj". MySQL returned error "1267: Illegal mix of collations (latin1_bin,IMPLICIT) and (utf8mb4_general_ci,COERCIBLE) for operation '=' (db522.1und1.de)".
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