diff --git a/contrib/xml2/expected/xml2.out b/contrib/xml2/expected/xml2.out
index 3d97b14c3a1..1906fcf33e2 100644
--- a/contrib/xml2/expected/xml2.out
+++ b/contrib/xml2/expected/xml2.out
@@ -261,3 +261,13 @@ $$<xsl:stylesheet version="1.0"
   </xsl:template>
 </xsl:stylesheet>$$);
 ERROR:  failed to apply stylesheet
+-- empty output
+select xslt_process('<aaa/>',
+$$<xsl:stylesheet version="1.0"
+      xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
+</xsl:stylesheet>$$);
+ xslt_process 
+--------------
+ 
+(1 row)
+
diff --git a/contrib/xml2/expected/xml2_1.out b/contrib/xml2/expected/xml2_1.out
index 31700040a60..9a2144d58f5 100644
--- a/contrib/xml2/expected/xml2_1.out
+++ b/contrib/xml2/expected/xml2_1.out
@@ -205,3 +205,9 @@ $$<xsl:stylesheet version="1.0"
   </xsl:template>
 </xsl:stylesheet>$$);
 ERROR:  xslt_process() is not available without libxslt
+-- empty output
+select xslt_process('<aaa/>',
+$$<xsl:stylesheet version="1.0"
+      xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
+</xsl:stylesheet>$$);
+ERROR:  xslt_process() is not available without libxslt
diff --git a/contrib/xml2/sql/xml2.sql b/contrib/xml2/sql/xml2.sql
index ef99d164f27..510d18a3679 100644
--- a/contrib/xml2/sql/xml2.sql
+++ b/contrib/xml2/sql/xml2.sql
@@ -153,3 +153,9 @@ $$<xsl:stylesheet version="1.0"
     </sax:output>
   </xsl:template>
 </xsl:stylesheet>$$);
+
+-- empty output
+select xslt_process('<aaa/>',
+$$<xsl:stylesheet version="1.0"
+      xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
+</xsl:stylesheet>$$);
diff --git a/contrib/xml2/xslt_proc.c b/contrib/xml2/xslt_proc.c
index b720d89f754..8ff7c7f1bbf 100644
--- a/contrib/xml2/xslt_proc.c
+++ b/contrib/xml2/xslt_proc.c
@@ -176,7 +176,14 @@ xslt_process(PG_FUNCTION_ARGS)
 	if (resstat < 0)
 		PG_RETURN_NULL();
 
-	result = cstring_to_text_with_len((char *) resstr, reslen);
+	/*
+	 * If an empty string has been returned, resstr would be NULL. In
+	 * this case, assume that the result is an empty string.
+	 */
+	if (reslen == 0)
+		result = cstring_to_text("");
+	else
+		result = cstring_to_text_with_len((char *) resstr, reslen);
 
 	if (resstr)
 		xmlFree(resstr);