2017-06-19 15:35:00

1 files changed, 12 insertions, 4 deletions

diff --git a/tex/context/base/mkiv/util-sql.lua b/tex/context/base/mkiv/util-sql.lua
index 0eff25130..d01a2267c 100644
--- a/tex/context/base/mkiv/util-sql.lua
+++ b/tex/context/base/mkiv/util-sql.lua
@@ -110,10 +110,14 @@ local defaults     = { __index =
 }
 
 setmetatableindex(sql.methods,function(t,k)
-    report_state("start loading method %a",k)
-    require("util-sql-imp-"..k)
-    report_state("loading method %a done",k)
-    return rawget(t,k)
+    if type(k) == "string" then
+        report_state("start loading method %a",k)
+        require("util-sql-imp-"..k)
+        report_state("loading method %a done",k)
+        return rawget(t,k)
+    else
+        report_state("invalid method %a",tostring(k))
+    end
 end)
 
 -- converters
@@ -332,6 +336,10 @@ function sql.usedatabase(presets,datatable)
         if not method then
             usedmethod = sql.methods.client
             method     = usedmethod and sqlmethods[usedmethod]
+            if not method then
+                report_state("invalid method")
+                return
+            end
         end
         local base      = presets.database or "test"
         local basename  = format("`%s`.`%s`",base,name)