Allowed memory size exhausted (line 130 of "/usr/share/php/Horde/ErrorHandler.php")

Dear Horde Developers,

Some time ago I am observing this error in the syslog:

----------
HORDE: Allowed memory size of 134217728 bytes exhausted (tried to
allocate 106430464 bytes) [pid 700 on line 130 of
"/usr/share/php/Horde/ErrorHandler.php"]
----------

As I see, the block referred to in the error is the following:

----------
125                 if (is_object($error)) {
126                     echo '<h3>' .
Horde_Core_Translation::t("Details") . '</h3>';
127                     echo '<h4>' . Horde_Core_Translation::t("The
full error message is logged in Horde's log file, and is shown below
only to administrators. Non-a    dministrative users will not see error
details.") . '</h4>';
128                     ob_flush();
129                     flush();
130                     echo '<div id="details"><pre>' .
htmlspecialchars(print_r($error, true)) . '</pre></div>';
131                 }
----------

Any information to fix it would be appreciated, since this error appears
approximately every 10 min in the syslog. If there is any way I can
provide more debug information, please let me know.

I'm using Horde Groupware 5.2.22.

Thanks in advance.

Kind regards,
Daniel

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