diff --git a/res/core/resources/horse.xml b/res/core/resources/horse.xml
index d7f794491..243b547db 100644
--- a/res/core/resources/horse.xml
+++ b/res/core/resources/horse.xml
@@ -4,8 +4,4 @@
     <construction skill="training" minskill="1"/>
     <function name="give" value="givehorses"/>
   </item>
-  <resourcelimit>
-    <function name="produce" value="lua_produceresource"/>
-    <function name="limit" value="lua_limitresource"/>
-  </resourcelimit>
 </resource>
diff --git a/res/core/resources/log.xml b/res/core/resources/log.xml
index 48662878f..3a1e8db50 100644
--- a/res/core/resources/log.xml
+++ b/res/core/resources/log.xml
@@ -1,12 +1,10 @@
 <?xml version="1.0"?>
-<resource name="log">
+<resource name="log" limited="yes">
   <item weight="500" score="10">
     <construction skill="forestry" minskill="1"/>
   </item>
   <resourcelimit>
     <modifier building="sawmill" type="skill" value="1"/>
     <modifier building="sawmill" type="material" value="0.5"/>
-    <function name="produce" value="lua_produceresource"/>
-    <function name="limit" value="lua_limitresource"/>
   </resourcelimit>
 </resource>
diff --git a/res/core/resources/mallorn.xml b/res/core/resources/mallorn.xml
index 96892b802..39a0230d1 100644
--- a/res/core/resources/mallorn.xml
+++ b/res/core/resources/mallorn.xml
@@ -1,12 +1,10 @@
 <?xml version="1.0"?>
-<resource name="mallorn">
+<resource name="mallorn" limited="yes">
   <item weight="500" score="30">
     <construction skill="forestry" minskill="2"/>
   </item>
   <resourcelimit>
     <modifier building="sawmill" type="skill" value="1"/>
     <modifier building="sawmill" type="material" value="0.5"/>
-    <function name="produce" value="lua_produceresource"/>
-    <function name="limit" value="lua_limitresource"/>
   </resourcelimit>
 </resource>
diff --git a/res/core/resources/mallornseed.xml b/res/core/resources/mallornseed.xml
index 01b8a3416..7a5a0310f 100644
--- a/res/core/resources/mallornseed.xml
+++ b/res/core/resources/mallornseed.xml
@@ -3,8 +3,4 @@
   <item weight="10" score="100">
     <construction skill="herbalism" minskill="4"/>
   </item>
-  <resourcelimit>
-    <function name="produce" value="lua_produceresource"/>
-    <function name="limit" value="lua_limitresource"/>
-  </resourcelimit>
 </resource>
diff --git a/res/core/resources/seed.xml b/res/core/resources/seed.xml
index 2bda26eeb..99f5f5804 100644
--- a/res/core/resources/seed.xml
+++ b/res/core/resources/seed.xml
@@ -3,8 +3,4 @@
   <item weight="10" score="50">
     <construction skill="herbalism" minskill="3"/>
   </item>
-  <resourcelimit>
-    <function name="produce" value="lua_produceresource"/>
-    <function name="limit" value="lua_limitresource"/>
-  </resourcelimit>
 </resource>
diff --git a/src/economy.c b/src/economy.c
index b1b9afb32..f7f23eb16 100644
--- a/src/economy.c
+++ b/src/economy.c
@@ -930,7 +930,6 @@ static void allocate_resource(unit * u, const resource_type * rtype, int want)
      * Materialverbrauch hat: */
     assert(itype != NULL && (itype->construction == NULL
         || itype->construction->materials == NULL));
-    assert(rdata != NULL);
 
     if (!rtype->raw) {
         int avail = limit_resource(r, rtype);
@@ -945,7 +944,7 @@ static void allocate_resource(unit * u, const resource_type * rtype, int want)
         return;
     }
 
-    if (rdata->modifiers) {
+    if (rdata && rdata->modifiers) {
         message *msg = get_modifiers(u, rdata->modifiers, &save_mod, &skill_mod);
         if (msg) {
             ADDMSG(&u->faction->msgs, msg);
diff --git a/src/kernel/xmlreader.c b/src/kernel/xmlreader.c
index ae8a76163..d4c31001e 100644
--- a/src/kernel/xmlreader.c
+++ b/src/kernel/xmlreader.c
@@ -980,6 +980,9 @@ static int parse_resources(xmlDocPtr doc)
             rmt_create(rtype);
         }
 
+        if (xml_bvalue(node, "limited", false)) {
+            rtype->flags |= RTF_LIMITED;
+        }
         /* reading eressea/resources/resource/resourcelimit */
         xpath->node = node;
         result = xmlXPathEvalExpression(BAD_CAST "resourcelimit", xpath);
@@ -988,7 +991,6 @@ static int parse_resources(xmlDocPtr doc)
             resource_limit *rdata = rtype->limit = calloc(1, sizeof(resource_limit));
             xmlNodePtr limit = result->nodesetval->nodeTab[0];
 
-            rtype->flags |= RTF_LIMITED;
             xpath->node = limit;
             xmlXPathFreeObject(result);