diff --git a/navalplanner-business/src/main/java/org/navalplanner/business/planner/limiting/entities/GapRequirements.java b/navalplanner-business/src/main/java/org/navalplanner/business/planner/limiting/entities/GapRequirements.java
index 635a749a6..0170b7376 100644
--- a/navalplanner-business/src/main/java/org/navalplanner/business/planner/limiting/entities/GapRequirements.java
+++ b/navalplanner-business/src/main/java/org/navalplanner/business/planner/limiting/entities/GapRequirements.java
@@ -26,6 +26,9 @@ import java.util.ListIterator;
 
 import org.apache.commons.lang.Validate;
 import org.joda.time.LocalDate;
+import org.navalplanner.business.calendars.entities.ResourceCalendar;
+import org.navalplanner.business.planner.limiting.entities.Gap.GapOnQueue;
+import org.navalplanner.business.resources.entities.Resource;
 
 
 /**
@@ -80,14 +83,16 @@ public class GapRequirements {
                         .isAfter(gapEnd));
     }
 
-    public AllocationOnGap guessValidity(Gap gap) {
+    public AllocationOnGap guessValidity(GapOnQueue gapOnQueue) {
+        Gap gap = gapOnQueue.getGap();
         if (!isPotentiallyValid(gap)) {
             return AllocationOnGap.invalidOn(gap);
         }
         DateAndHour realStart = DateAndHour.Max(earliestPossibleStart, gap
                 .getStartTime());
+        Resource resource = gapOnQueue.getOriginQueue().getResource();
         List<Integer> hours = gap.getHoursInGapUntilAllocatingAndGoingToTheEnd(
-                element.getResource().getCalendar(), realStart,
+                resource.getCalendar(), realStart,
                 earliestPossibleEnd, element.getIntentedTotalHours());
         int total = sum(hours);
         if (total < element.getIntentedTotalHours()) {
diff --git a/navalplanner-webapp/src/main/java/org/navalplanner/web/limitingresources/LimitingResourceQueueModel.java b/navalplanner-webapp/src/main/java/org/navalplanner/web/limitingresources/LimitingResourceQueueModel.java
index 5ba5711f3..8d859029c 100644
--- a/navalplanner-webapp/src/main/java/org/navalplanner/web/limitingresources/LimitingResourceQueueModel.java
+++ b/navalplanner-webapp/src/main/java/org/navalplanner/web/limitingresources/LimitingResourceQueueModel.java
@@ -413,7 +413,7 @@ public class LimitingResourceQueueModel implements ILimitingResourceQueueModel {
             for (GapOnQueue eachSubGap : getSubGaps(each, requirements
                     .getElement(), generic)) {
                 AllocationOnGap allocation = requirements
-                        .guessValidity(eachSubGap.getGap());
+                        .guessValidity(eachSubGap);
                 if (allocation.isValid()) {
                     doAllocation(requirements, allocation, eachSubGap.getOriginQueue());
                     return true;