diff --git a/sql/swad.sql b/sql/swad.sql
index 7a2585eb6..a7d82bf7a 100644
--- a/sql/swad.sql
+++ b/sql/swad.sql
@@ -137,9 +137,9 @@ CREATE TABLE IF NOT EXISTS bld_buildings (
 	UNIQUE INDEX(BldCod),
 	INDEX(CtrCod));
 --
--- Table chat: stores number of users in each chat room (this table is not used now)
+-- Table cht_rooms: stores number of users in each chat room (this table is not used now)
 --
-CREATE TABLE IF NOT EXISTS chat (
+CREATE TABLE IF NOT EXISTS cht_rooms (
 	RoomCode VARCHAR(16) NOT NULL,
 	NumUsrs INT NOT NULL,
 	UNIQUE INDEX(RoomCode));
diff --git a/swad_changelog.h b/swad_changelog.h
index d8f31b869..9c445a992 100644
--- a/swad_changelog.h
+++ b/swad_changelog.h
@@ -600,12 +600,16 @@ TODO: Salvador Romero Cort
 
 TODO: FIX BUG, URGENT! En las fechas como parámetro Dat_WriteParamsIniEndDates(), por ejemplo al cambiar el color de la gráfica de accesos por día y hora, no se respeta la zona horaria.
 */
-#define Log_PLATFORM_VERSION	"SWAD 20.50.6 (2021-03-17)"
+#define Log_PLATFORM_VERSION	"SWAD 20.50.7 (2021-03-17)"
 #define CSS_FILE		"swad20.45.css"
 #define JS_FILE			"swad20.6.2.js"
 /*
 TODO: Rename CENTRE to CENTER in help wiki.
 
+	Version 20.50.7:  Mar 17, 2021  Chat database table renamed. (307318 lines)
+					1 change necessary in database:
+RENAME TABLE chat TO cht_rooms;
+
 	Version 20.50.6:  Mar 17, 2021  Buildings database table renamed. (307310 lines)
 					1 change necessary in database:
 RENAME TABLE buildings TO bld_buildings;
diff --git a/swad_chat.c b/swad_chat.c
index 56f94fdc6..2a47f848c 100644
--- a/swad_chat.c
+++ b/swad_chat.c
@@ -244,9 +244,12 @@ void Cht_ShowListOfChatRoomsWithUsrs (void)
    /***** Get chat rooms with connected users from database *****/
    NumRows = DB_QuerySELECT (&mysql_res,"can not get chat rooms"
 					" with connected users",
-			     "SELECT RoomCode,NumUsrs FROM chat"
+			     "SELECT RoomCode,"		// row[0]
+			            "NumUsrs"		// row[1]
+			      " FROM cht_rooms"
 			     " WHERE NumUsrs>0"
-			     " ORDER BY NumUsrs DESC,RoomCode");
+			     " ORDER BY NumUsrs DESC,"
+			               "RoomCode");
    if (NumRows > 0) // If not empty chat rooms found
      {
       /***** Begin box and table *****/
@@ -353,7 +356,9 @@ static unsigned Cht_GetNumUsrsInChatRoom (const char *RoomCode)
    /***** Get number of users connected to chat rooms from database *****/
    if (DB_QuerySELECT (&mysql_res,"can not get number of users"
 				  " connected to a chat room",
-		       "SELECT NumUsrs FROM chat WHERE RoomCode='%s'",
+		       "SELECT NumUsrs"
+		        " FROM cht_rooms"
+		       " WHERE RoomCode='%s'",
 		       RoomCode))
      {
       /* Get number of users connected to the chat room */
diff --git a/swad_database.c b/swad_database.c
index 426ef0725..08b11348e 100644
--- a/swad_database.c
+++ b/swad_database.c
@@ -381,9 +381,9 @@ mysql> DESCRIBE bld_buildings;
 		   "UNIQUE INDEX(BldCod),"
 		   "INDEX(CtrCod))");
 
-   /***** Table chat *****/
+   /***** Table cht_rooms *****/
 /*
-mysql> DESCRIBE chat;
+mysql> DESCRIBE cht_rooms;
 +----------+-------------+------+-----+---------+-------+
 | Field    | Type        | Null | Key | Default | Extra |
 +----------+-------------+------+-----+---------+-------+