diff --git a/base b/base
index 1c0cf8963..3ff07f9a0 160000
--- a/base
+++ b/base
@@ -1 +1 @@
-Subproject commit 1c0cf8963b19068679b19ef52ebffd0ffafae627
+Subproject commit 3ff07f9a05f3b075798b67a15aa0881733e2751d
diff --git a/frontend/cache.lua b/frontend/cache.lua
index 60f1bc826..a7306a619 100644
--- a/frontend/cache.lua
+++ b/frontend/cache.lua
@@ -69,8 +69,8 @@ end
 function Cache:insert(key, object)
     -- guarantee that we have enough memory in cache
     if(object.size > self.max_memsize) then
-        -- we're not allowed to claim this much at all
-        error("too much memory claimed")
+        DEBUG("too much memory claimed for", key)
+        return
     end
     -- delete objects that least recently used
     -- (they are at the end of the cache_order array)
diff --git a/frontend/document/credocument.lua b/frontend/document/credocument.lua
index 5d77ff10f..bae09b6ad 100644
--- a/frontend/document/credocument.lua
+++ b/frontend/document/credocument.lua
@@ -148,9 +148,11 @@ function CreDocument:getCoverPageImage()
     local data, size = self._document:getCoverPageImageData()
     if data and size then
         local Mupdf = require("ffi/mupdf")
-        local image = Mupdf.renderImage(data, size)
-        ffi.C.free(data)
-        return image
+        local ok, image = pcall(Mupdf.renderImage, data, size)
+        if ok then
+            ffi.C.free(data)
+            return image
+        end
     end
 end