Fatal error: Uncaught TypeError: Unsupported operand types: string - float in /var/www/faxi/harbor/DB/Reading/ReadingSQL.php:304 Stack trace: #0 /var/www/faxi/harbor/DB/Reading/Reading.php(61): ReadingSQL->getCustomGraphDataArray() #1 /var/www/faxi/harbor/Src/classes/CustomGraphs.php(212): Reading->getCustomGraphDataArray() #2 /var/www/faxi/harbor/Src/classes/CustomGraphs.php(125): CustomGraphs->getGraphData() #3 /var/www/faxi/harbor/Src/classes/CustomGraphs.php(72): CustomGraphs->createGraph() #4 /var/www/faxi/harbor/Pages/Graphs/customGraph.php(24): CustomGraphs->initFrontPageGraphs() #5 /var/www/faxi/harbor/Pages/Graphs/frontPageGraphs.php(51): include('...') #6 /var/www/faxi/harbor/Pages/Stations.php(23): include('...') #7 /var/www/faxi/harbor/Pages/Main.php(6): include('...') #8 /var/www/faxi/harbor/index.php(53): include_once('...') #9 {main} thrown in /var/www/faxi/harbor/DB/Reading/ReadingSQL.php on line 304