added null pointer check in skill conversion

source/RobotAPI/libraries/skills/core/FluxioSkill.cpp

 #include "FluxioSkill.h"
 #include <vector>
+#include <ArmarXCore/core/logging/Logging.h>
 #include "FluxioParameterNode.h"
 #include "FluxioNode.h"
 #include "FluxioEdge.h"
@@ -13,6 +14,12 @@ namespace armarx
         manager::dto::FluxioSkill
         FluxioSkill::toManagerIce() const
         {
+            if(skillProviderPtr == nullptr)
+            {
+                ARMARX_WARNING << "SkillProvider for Skill with id " << id << " not set"; // TODO: create general error message structure
+                return {};
+            }
+
             manager::dto::FluxioSkill ret;
             
             ret.id = id;

source/RobotAPI/libraries/skills/manager/SkillManagerComponentPluginUser.cpp

@@ -149,7 +149,7 @@ namespace armarx
     }
 
     //** Fluxio related methods
-    
+
     skills::manager::dto::FluxioSkillList
     SkillManagerComponentPluginUser::getSkillList(const Ice::Current& current)
     {