diff --git a/include/Nazara/Core/Bitset.inl b/include/Nazara/Core/Bitset.inl
index 783db508d..abb69e5d1 100644
--- a/include/Nazara/Core/Bitset.inl
+++ b/include/Nazara/Core/Bitset.inl
@@ -480,6 +480,11 @@ unsigned int NzBitset<Block, Allocator>::FindFirstFrom(unsigned int blockIndex)
 		if (m_blocks[i])
 			break;
 	}
+
+	// Est-ce qu'on a un bloc non-nul ?
+	if (i == m_blocks.size()-1)
+		return npos;
+
 	Block block = m_blocks[i];
 
 	// Calcul de la position du LSB dans le bloc (et ajustement de la position)