3 files changed, 17 insertions, 7 deletions
diff --git a/src/modules/m_nicklock.cpp b/src/modules/m_nicklock.cpp
index 315f8390e..36bf0598d 100644
--- a/src/modules/m_nicklock.cpp
+++ b/src/modules/m_nicklock.cpp
@@ -55,11 +55,12 @@ class cmd_nicklock : public command_t
 			{
 				// give them a lock flag
 				Srv->SendOpers(std::string(user->nick)+" used NICKLOCK to change and hold "+std::string(parameters[0])+" to "+parameters[1]);
-				Srv->ChangeUserNick(source,std::string(parameters[1]));
-				// only attempt to set their lockflag after we know the change succeeded
-				source = Srv->FindNick(std::string(parameters[1]));
-				if (source)
-					source->Extend("nick_locked", "ON");
+				if (!source->ForceNickChange(parameters[1]))
+				{
+					userrec::QuitUser(source, "Nickname collision");
+					return;
+				}
+				source->Extend("nick_locked", "ON");
 			}
 		}
 	}
diff --git a/src/modules/m_sanick.cpp b/src/modules/m_sanick.cpp
index 09b585b14..561bca613 100644
--- a/src/modules/m_sanick.cpp
+++ b/src/modules/m_sanick.cpp
@@ -50,7 +50,12 @@ class cmd_sanick : public command_t
 				// FIX by brain: Cant use source->nick here because if it traverses a server link then
 				// source->nick becomes invalid as the object data moves in memory.
 				Srv->SendOpers(std::string(user->nick)+" used SANICK to change "+std::string(parameters[0])+" to "+parameters[1]);
-				Srv->ChangeUserNick(source,std::string(parameters[1]));
+				if (!source->ForceNickChange(parameters[1]))
+				{
+					/* We couldnt change the nick */
+					userrec::QuitUser(source, "Nickname collision");
+					return;
+				}
 			}
 		}
 	}
diff --git a/src/modules/m_spanningtree.cpp b/src/modules/m_spanningtree.cpp
index 491c3c471..1e908f07b 100644
--- a/src/modules/m_spanningtree.cpp
+++ b/src/modules/m_spanningtree.cpp
@@ -2014,7 +2014,11 @@ class TreeSocket : public InspSocket
 				/* This is not required as one is sent in OnUserPostNick below
 				 */
 				//DoOneToMany(u->nick,"NICK",par);
-				Srv->ChangeUserNick(u,params[1]);
+				if (!u->ForceNickChange(params[1].c_str()))
+				{
+					userrec::QuitUser(u, "Nickname collision");
+					return true;
+				}
 				u->age = atoi(params[2].c_str());
 			}
 		}