I've never had that issue but you could try a smear of McNett seam seal or similar - that might sort it. I've also discovered some incredible sticky tape called Tear Aid which might do the job for you - it's quite expensive but pretty amazing at repairing tent canvas, sails etc. IIRC, you would need Tear Aid Type A - suggests you Google it. Of course, this all predicated on identifying the spot where the leak is. Hope this helps.
we had an awning that leaked along the kador strip on the awning but it ended up being the stitching that fixed the Velcro straps that could be used for attachment if you had roof bars so i unpicked the stitching and removed the Velcro then restitched and sealed with a tiny amount of seam sealant
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