Metaanalysis with zero event studies

Hello everyone,

I am working on a metaanalysis of proportions in RStudio looking at the proportion of complications between "treatment A (cases)" & "Treatment B (controls)". The studies from the control group reported 0 events and/or 0 complications and/or 100% success, for which I would have, Cases= 0 , given any total sample size per group.

This is my code for the "control group"


When I am pooling the effect size, I get this error message:

Error: Stopped because k = 0 after subsetting.

Could anybody help me figuring out this problem? I cannot exclude the control group because having 0 events is also important and informative.

Appreciate any help,

I challenge you to justify that this is important and informative...

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