diff --git a/js/src/gc/Statistics.cpp b/js/src/gc/Statistics.cpp
index be9fd4824234..f9afc2d04caf 100644
--- a/js/src/gc/Statistics.cpp
+++ b/js/src/gc/Statistics.cpp
@@ -782,7 +782,7 @@ Statistics::~Statistics()
         fclose(fp);
 }
 
-/* static */ void
+/* static */ bool
 Statistics::initialize()
 {
     for (size_t i = 0; i < PHASE_LIMIT; i++) {
@@ -806,7 +806,8 @@ Statistics::initialize()
         MOZ_ASSERT(phases[child].parent == PHASE_MULTI_PARENTS);
         int j = child;
         do {
-            dagDescendants[phaseExtra[parent].dagSlot].append(Phase(j));
+            if (!dagDescendants[phaseExtra[parent].dagSlot].append(Phase(j)))
+                return false;
             j++;
         } while (j != PHASE_LIMIT && phases[j].parent != PHASE_MULTI_PARENTS);
     }
@@ -815,7 +816,8 @@ Statistics::initialize()
     // Fill in the depth of each node in the tree. Multi-parented nodes
     // have depth 0.
     mozilla::Vector<Phase> stack;
-    stack.append(PHASE_LIMIT); // Dummy entry to avoid special-casing the first node
+    if (!stack.append(PHASE_LIMIT)) // Dummy entry to avoid special-casing the first node
+        return false;
     for (int i = 0; i < PHASE_LIMIT; i++) {
         if (phases[i].parent == PHASE_NO_PARENT ||
             phases[i].parent == PHASE_MULTI_PARENTS)
@@ -826,9 +828,11 @@ Statistics::initialize()
                 stack.popBack();
         }
         phaseExtra[i].depth = stack.length();
-        stack.append(Phase(i));
+        if (!stack.append(Phase(i)))
+            return false;
     }
 
+    return true;
 }
 
 JS::GCSliceCallback
diff --git a/js/src/gc/Statistics.h b/js/src/gc/Statistics.h
index 3f78225ef689..b0cb5c123d7c 100644
--- a/js/src/gc/Statistics.h
+++ b/js/src/gc/Statistics.h
@@ -162,7 +162,7 @@ struct Statistics
     /* Create a convenient type for referring to tables of phase times. */
     using PhaseTimeTable = int64_t[NumTimingArrays][PHASE_LIMIT];
 
-    static void initialize();
+    static bool initialize();
 
     explicit Statistics(JSRuntime* rt);
     ~Statistics();
diff --git a/js/src/vm/Initialization.cpp b/js/src/vm/Initialization.cpp
index 6001808180d0..502d640aa008 100644
--- a/js/src/vm/Initialization.cpp
+++ b/js/src/vm/Initialization.cpp
@@ -104,7 +104,8 @@ JS_Init(void)
     if (!FutexRuntime::initialize())
         return false;
 
-    js::gcstats::Statistics::initialize();
+    if (!js::gcstats::Statistics::initialize())
+        return false;
 
     libraryInitState = InitState::Running;
     return true;