diff --git a/poi-ooxml/src/main/java/org/apache/poi/xssf/usermodel/XSSFTableStyle.java b/poi-ooxml/src/main/java/org/apache/poi/xssf/usermodel/XSSFTableStyle.java
index cbbdef9c4a2..652c377e1a0 100644
--- a/poi-ooxml/src/main/java/org/apache/poi/xssf/usermodel/XSSFTableStyle.java
+++ b/poi-ooxml/src/main/java/org/apache/poi/xssf/usermodel/XSSFTableStyle.java
@@ -84,6 +84,9 @@ public XSSFTableStyle(int index, CTDxfs dxfs, CTTableStyle tableStyle, IndexedCo
         }
 
         for (CTTableStyleElement element : tableStyle.getTableStyleElementList()) {
+            if (element.getType() == null) {
+                throw new IllegalArgumentException("Did not have a type in table-style " + element);
+            }
             TableStyleType type = TableStyleType.valueOf(element.getType().toString());
             DifferentialStyleProvider dstyle = null;
             if (element.isSetDxfId()) {
diff --git a/test-data/spreadsheet/clusterfuzz-testcase-minimized-XLSX2CSVFuzzer-5542865479270400.xlsx b/test-data/spreadsheet/clusterfuzz-testcase-minimized-XLSX2CSVFuzzer-5542865479270400.xlsx
new file mode 100644
index 00000000000..4dc129d8f0f
Binary files /dev/null and b/test-data/spreadsheet/clusterfuzz-testcase-minimized-XLSX2CSVFuzzer-5542865479270400.xlsx differ
diff --git a/test-data/spreadsheet/stress.xls b/test-data/spreadsheet/stress.xls
index fd160eeb720..84b3a84857a 100644
Binary files a/test-data/spreadsheet/stress.xls and b/test-data/spreadsheet/stress.xls differ