Steps to reproduce

when exporting a statistic from a survey with the following options:

Main options:
Include: "All responses"
Output format: "Excel"
View summary of all available fields: "On"
Show graphs: "Off"

Output options:
Show text responses inline: "On"
Subtotals based on displayed or answered questions: "Off"
Chart type: "As defined in question settings"
Number of columns: "Two"
Graph labels: "Question code"

the export via the button "view statistics" failed with the following error message: "an error occured! Please reload the page!"

Expected result

export statistics with the output format "PDF" and "Excel" works again

Actual result

export statistics with the output format "PDF" and "Excel" not work.