diff --git a/navalplanner-business/src/main/java/org/navalplanner/business/planner/entities/ResourceAllocation.java b/navalplanner-business/src/main/java/org/navalplanner/business/planner/entities/ResourceAllocation.java
index ec4a59163..87a7ddc91 100644
--- a/navalplanner-business/src/main/java/org/navalplanner/business/planner/entities/ResourceAllocation.java
+++ b/navalplanner-business/src/main/java/org/navalplanner/business/planner/entities/ResourceAllocation.java
@@ -874,11 +874,17 @@ public abstract class ResourceAllocation<T extends DayAssignment> extends
 
         public IntervalInsideTask(LocalDate startInclusive,
                 LocalDate endExclusive) {
-            this.start = IntraDayDate.max(IntraDayDate
-                    .startOfDay(startInclusive), getTask()
-                    .getFirstDayNotConsolidated());
-            this.end = IntraDayDate.min(task.getIntraDayEndDate(),
-                    IntraDayDate.startOfDay(endExclusive));
+            Validate.isTrue(startInclusive.compareTo(endExclusive) <= 0);
+
+            IntraDayDate taskStart = getTask().getFirstDayNotConsolidated();
+            IntraDayDate taskEnd = task.getIntraDayEndDate();
+
+            this.start = IntraDayDate.min(IntraDayDate.max(IntraDayDate
+                    .startOfDay(startInclusive), taskStart), taskEnd);
+
+            this.end = IntraDayDate.max(
+                    IntraDayDate.min(taskEnd,
+                            IntraDayDate.startOfDay(endExclusive)), taskStart);
         }
 
         public IntraDayDate getStart() {
diff --git a/navalplanner-business/src/test/java/org/navalplanner/business/test/planner/entities/SpecificResourceAllocationTest.java b/navalplanner-business/src/test/java/org/navalplanner/business/test/planner/entities/SpecificResourceAllocationTest.java
index 59297ac09..8ab3940f4 100644
--- a/navalplanner-business/src/test/java/org/navalplanner/business/test/planner/entities/SpecificResourceAllocationTest.java
+++ b/navalplanner-business/src/test/java/org/navalplanner/business/test/planner/entities/SpecificResourceAllocationTest.java
@@ -327,6 +327,24 @@ public class SpecificResourceAllocationTest {
                 haveHours(4, 4, 4));
     }
 
+    @Test
+    public void ifTheProvidedIntervalIsAfterTheTaskDoesntAllocateAnything() {
+        LocalDate start = new LocalDate(2000, 2, 4);
+        givenSpecificResourceAllocation(start, 4);
+        specificResourceAllocation.onInterval(start.plusDays(5),
+                start.plusDays(6)).allocateHours(12);
+        assertTrue(specificResourceAllocation.getAssignments().isEmpty());
+    }
+
+    @Test
+    public void ifTheProvidedIntervalIsBeforeTheTaskDoesntAllocateAnything() {
+        LocalDate start = new LocalDate(2000, 2, 4);
+        givenSpecificResourceAllocation(start, 4);
+        specificResourceAllocation.onInterval(start.minusDays(5),
+                start.minusDays(2)).allocateHours(12);
+        assertTrue(specificResourceAllocation.getAssignments().isEmpty());
+    }
+
     @Test
     public void thePartOfTheIntervalUsedIsTheOneOverlappingWithTheTask() {
         LocalDate start = new LocalDate(2000, 2, 4);