Error during update

Hi

I had a problem on ProjeQtOr, it seems to be a wait lock at DB level.

I attach the log

2016-01-06 14:29:55.836 ***** ERROR ***** Exception-[HY000] SQLSTATE[HY000]: General error: 1205 Lock wait timeout exceeded; try restarting transaction
2016-01-06 14:29:55.837 ***** ERROR ***** For query : update planningelement set assignedWork='0.5' , leftWork='0.5' , plannedWork='0.5' where id=802
2016-01-06 14:29:55.837 ***** ERROR ***** Strack trace :
2016-01-06 14:29:55.837 ***** ERROR ***** #0 Sql->query called at [/var/www/html/projeqtor/model/persistence/SqlElement.php:893]
2016-01-06 14:29:55.837 ***** ERROR ***** #1 SqlElement->updateSqlElement called at [/var/www/html/projeqtor/model/persistence/SqlElement.php:559]
2016-01-06 14:29:55.837 ***** ERROR ***** #2 SqlElement->saveSqlElement called at [/var/www/html/projeqtor/model/persistence/SqlElement.php:454]
2016-01-06 14:29:55.837 ***** ERROR ***** #3 SqlElement->save called at [/var/www/html/projeqtor/model/PlanningElement.php:381]
2016-01-06 14:29:55.837 ***** ERROR ***** #4 PlanningElement->save called at [/var/www/html/projeqtor/model/ActivityPlanningElementMain.php:176]
2016-01-06 14:29:55.837 ***** ERROR ***** #5 ActivityPlanningElementMain->save called at [/var/www/html/projeqtor/model/PlanningElement.php:712]
2016-01-06 14:29:55.837 ***** ERROR ***** #6 PlanningElement->updateSynthesisObj called at [/var/www/html/projeqtor/model/PlanningElement.php:737]
2016-01-06 14:29:55.838 ***** ERROR ***** #7 PlanningElement->updateSynthesis called at [/var/www/html/projeqtor/model/Assignment.php:181]
2016-01-06 14:29:55.838 ***** ERROR ***** #8 Assignment->save called at [/var/www/html/projeqtor/tool/saveAssignment.php:139]
2016-01-06 14:31:11.912 ***** ERROR ***** Exception-[HY000] SQLSTATE[HY000]: General error: 1205 Lock wait timeout exceeded; try restarting transaction
2016-01-06 14:31:11.912 ***** ERROR ***** For query : insert into planningelement ( idProject , refType , refId , refName , validatedWork , wbs , priority , idPlanningMode , wbsSortable , topId , topRefType , topRefId , idle , elementary , done , cancelled , validatedCalculated ) values ('163', 'Activity', '437', 'Upgrade VM Hardware « Cluster Lame Production PAREL » (22 VM)', '0.5', '21.7.3.6', '500', '1', '021.007.003.006', '753', 'Project', '163', '0', '1', '0', '0', '0')
2016-01-06 14:31:11.912 ***** ERROR ***** Strack trace :
2016-01-06 14:31:11.912 ***** ERROR ***** #0 Sql->query called at [/var/www/html/projeqtor/model/persistence/SqlElement.php:752]
2016-01-06 14:31:11.912 ***** ERROR ***** #1 SqlElement->insertSqlElement called at [/var/www/html/projeqtor/model/persistence/SqlElement.php:565]
2016-01-06 14:31:11.912 ***** ERROR ***** #2 SqlElement->saveSqlElement called at [/var/www/html/projeqtor/model/persistence/SqlElement.php:454]
2016-01-06 14:31:11.912 ***** ERROR ***** #3 SqlElement->save called at [/var/www/html/projeqtor/model/PlanningElement.php:381]
2016-01-06 14:31:11.912 ***** ERROR ***** #4 PlanningElement->save called at [/var/www/html/projeqtor/model/ActivityPlanningElementMain.php:176]
2016-01-06 14:31:11.912 ***** ERROR ***** #5 ActivityPlanningElementMain->save called at [/var/www/html/projeqtor/model/persistence/SqlElement.php:972]
2016-01-06 14:31:11.913 ***** ERROR ***** #6 SqlElement->saveDependantObjects called at [/var/www/html/projeqtor/model/persistence/SqlElement.php:765]
2016-01-06 14:31:11.913 ***** ERROR ***** #7 SqlElement->insertSqlElement called at [/var/www/html/projeqtor/model/persistence/SqlElement.php:565]
2016-01-06 14:31:11.913 ***** ERROR ***** #8 SqlElement->saveSqlElement called at [/var/www/html/projeqtor/model/persistence/SqlElement.php:454]
2016-01-06 14:31:11.913 ***** ERROR ***** #9 SqlElement->save called at [/var/www/html/projeqtor/model/ActivityMain.php:280]
2016-01-06 14:31:11.913 ***** ERROR ***** #10 ActivityMain->save called at [/var/www/html/projeqtor/tool/saveObject.php:85]

Is it possible to avoid this behavior?