diff --git a/swad_changelog.h b/swad_changelog.h
index 1df174d59..8d3367348 100644
--- a/swad_changelog.h
+++ b/swad_changelog.h
@@ -264,13 +264,14 @@
 /****************************** Public constants *****************************/
 /*****************************************************************************/
 
-#define Log_PLATFORM_VERSION	"SWAD 17.26.1 (2017-11-10)"
+#define Log_PLATFORM_VERSION	"SWAD 17.26.2 (2017-11-12)"
 #define CSS_FILE		"swad17.25.4.css"
 #define JS_FILE			"swad17.17.1.js"
 
 // Number of lines (includes comments but not blank lines) has been got with the following command:
 // nl swad*.c swad*.h css/swad*.css py/swad*.py js/swad*.js soap/swad*?.h sql/swad*.sql | tail -1
 /*
+        Version 17.26.2:  Nov 12, 2017  Fixed bug in marks, reported by Francisco Ocaņa Lara. (234383 lines)
         Version 17.26.1:  Nov 10, 2017  Default theme is white. (234380 lines)
         Version 17.26:    Nov 08, 2017  Tables converted to MyISAM.
 					Cleaning database. (234379 lines)
diff --git a/swad_mark.c b/swad_mark.c
index 118c5c44d..1d071d18b 100644
--- a/swad_mark.c
+++ b/swad_mark.c
@@ -193,10 +193,14 @@ static void Mrk_GetNumRowsHeaderAndFooter (struct MarksProperties *Marks)
    unsigned long NumRows;
 
    /***** Get number of rows of header and footer from database *****/
+   /* There should be a single file in database.
+      If, due to an error, there is more than one file,
+      get the number of rows of the more recent file. */
    sprintf (Query,"SELECT marks_properties.%s,marks_properties.%s"
 	          " FROM files,marks_properties"
                   " WHERE files.FileBrowser=%u AND files.Cod=%ld AND files.Path='%s'"
-                  " AND files.FilCod=marks_properties.FilCod",
+                  " AND files.FilCod=marks_properties.FilCod"
+                  " ORDER BY files.FilCod DESC LIMIT 1",	// On duplicate entries, get the more recent
             Mrk_HeadOrFootStr[Brw_HEADER],
             Mrk_HeadOrFootStr[Brw_FOOTER],
             (unsigned) Brw_FileBrowserForDB_files[Gbl.FileBrowser.Type],
@@ -218,11 +222,9 @@ static void Mrk_GetNumRowsHeaderAndFooter (struct MarksProperties *Marks)
       if (sscanf (row[1],"%u",&(Marks->Footer)) != 1)
          Lay_ShowErrorAndExit ("Wrong number of footer rows.");
      }
-   else if (NumRows == 0)	// Unknown numbers of header and footer rows
+   else	// Unknown numbers of header and footer rows
       Marks->Header =
       Marks->Footer = 0;
-   else	// Number of entries in database > 1
-      Lay_ShowErrorAndExit ("Error when getting the number of rows in header and footer.");
 
    /***** Free structure that stores the query result *****/
    DB_FreeMySQLResult (&mysql_res);