diff --git a/web/site/instances.php b/web/site/instances.php
index 8ee3eef..d330dc5 100644
--- a/web/site/instances.php
+++ b/web/site/instances.php
@@ -959,7 +959,7 @@ function tquery($query,$line) {
 	$bt=hrtime(true);
 	//usleep(rand(10000,1050000));
 	$res=mysqli_query($link,$query) or muorimeglio('Error on line '.$line.': '.mysqli_error($link),true);
-	debug(sprintf('%f secs. for query «'.$query.'»'.N,hrte($bt)),$debug);
+	debug(sprintf('%f secs. for query «'.str_replace('%','%%',$query).'»'.N,hrte($bt)),$debug);
 	return $res;
 }