Checking on 2.6.7 Build SondagesPro 1.6., 2.73.1 and 3.15.5 github : no issue.
There are no 2.7.x , but your version is broken : need to fix the code …
Assistance on LimeSurvey forum and LimeSurvey core development are on my free time.
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Plugins, theme and development
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