Allowed memory size exhausted

Hi there,

when I open https://supscout.de/places/lenggries/sylvensteinsee-einstieg-grillplatz-fall/ some images are not loaded. The PHP log shows the following:

[15-Jun-2017 09:46:06 UTC] PHP Fatal error: Allowed memory size of 268435456 bytes exhausted (tried to allocate 60688516 bytes) in …/wp-content/plugins/cdn-enabler/inc/cdn_enabler_rewriter.class.php on line 137
[15-Jun-2017 09:46:06 UTC] PHP Fatal error: Unknown: Cannot use output buffering in output buffering display handlers in Unknown on line 0

Is there a way to fix that other than to increase the memory? Why does the plugin need that much memory at that point?

Thanks in advance.
Jonas