add compatibility fix for #296
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@ -110,7 +110,7 @@ end
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local function do_digging(pos, meta, net_time)
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local us_start = minetest.get_us_time()
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local step = tonumber(meta:get("step"))
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local step = tonumber(meta:get("step") or "")
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if not step then
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-- Missing metadata or not yet updated by conversion LBM, abort digging
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return
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