Index: src/includes/core/template-functions.php
===================================================================
--- src/includes/core/template-functions.php	(revision 5809)
+++ src/includes/core/template-functions.php	(working copy)
@@ -511,21 +511,13 @@
 		// Setup the default user variable
 		$the_user = false;
 
-		// If using pretty permalinks, use the email or slug
+		// If using pretty permalinks, use the slug
 		if ( get_option( 'permalink_structure' ) ) {
-
-			// Email was passed
-			if ( is_email( $bbp_user ) ) {
-				$the_user = get_user_by( 'email', $bbp_user );
-
-			// Try nicename
-			} else {
-				$the_user = get_user_by( 'slug', $bbp_user );
-			}
+			$the_user = get_user_by( 'slug', $bbp_user );
 		}
 
 		// No user found by slug/email, so try the ID if it's numeric
-		if ( empty( $the_user ) && is_numeric( $bbp_user ) ) {
+		elseif ( is_numeric( $bbp_user ) ) {
 			$the_user = get_user_by( 'id', $bbp_user );
 		}