diff --git a/src/common/classes/array.h b/src/common/classes/array.h
index 9261b3fb562..8f709eb2f8e 100644
--- a/src/common/classes/array.h
+++ b/src/common/classes/array.h
@@ -186,7 +186,8 @@ class Array : protected Storage
 	void copyFrom(const Array<T, Storage>& source)
 	{
 		ensureCapacity(source.count, false);
-		memcpy(static_cast<void*>(data), source.data, sizeof(T) * source.count);
+		if (source.count)
+			memcpy(static_cast<void*>(data), source.data, sizeof(T) * source.count);
 		count = source.count;
 	}
 
@@ -244,8 +245,10 @@ class Array : protected Storage
 		fb_assert(index <= count);
 		fb_assert(count < FB_MAX_SIZEOF);
 		ensureCapacity(count + 1);
-		memmove(static_cast<void*>(data + index + 1), data + index, sizeof(T) * (count++ - index));
+		if (count - index)
+			memmove(static_cast<void*>(data + index + 1), data + index, sizeof(T) * (count - index));
 		data[index] = item;
+		++count;
 	}
 
 	void insert(const size_type index, const Array<T, Storage>& items)
@@ -253,8 +256,10 @@ class Array : protected Storage
 		fb_assert(index <= count);
 		fb_assert(count <= FB_MAX_SIZEOF - items.count);
 		ensureCapacity(count + items.count);
-		memmove(static_cast<void*>(data + index + items.count), data + index, sizeof(T) * (count - index));
-		memcpy(static_cast<void*>(data + index), items.data, items.count);
+		if (count - index)
+			memmove(static_cast<void*>(data + index + items.count), data + index, sizeof(T) * (count - index));
+		if (items.count)
+			memcpy(static_cast<void*>(data + index), items.data, sizeof(T) * items.count);
 		count += items.count;
 	}
 
@@ -263,8 +268,10 @@ class Array : protected Storage
 		fb_assert(index <= count);
 		fb_assert(count <= FB_MAX_SIZEOF - itemsCount);
 		ensureCapacity(count + itemsCount);
-		memmove(static_cast<void*>(data + index + itemsCount), data + index, sizeof(T) * (count - index));
-		memcpy(static_cast<void*>(data + index), items, sizeof(T) * itemsCount);
+		if (count - index)
+			memmove(static_cast<void*>(data + index + itemsCount), data + index, sizeof(T) * (count - index));
+		if (itemsCount)
+			memcpy(static_cast<void*>(data + index), items, sizeof(T) * itemsCount);
 		count += itemsCount;
 	}