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-rw-r--r--src/Protocol/Protocol17x.cpp1
1 files changed, 1 insertions, 0 deletions
diff --git a/src/Protocol/Protocol17x.cpp b/src/Protocol/Protocol17x.cpp
index af1dd06a5..162d4da30 100644
--- a/src/Protocol/Protocol17x.cpp
+++ b/src/Protocol/Protocol17x.cpp
@@ -1358,6 +1358,7 @@ void cProtocol172::SendUpdateBlockEntity(cBlockEntity & a_BlockEntity)
void cProtocol172::SendUpdateSign(int a_BlockX, int a_BlockY, int a_BlockZ, const AString & a_Line1, const AString & a_Line2, const AString & a_Line3, const AString & a_Line4)
{
ASSERT(m_State == 3); // In game mode?
+ ASSERT((a_BlockY >= 0) && (a_BlockY < cChunkDef::Height));
cPacketizer Pkt(*this, 0x33);
Pkt.WriteInt(a_BlockX);