diff --git a/collectors/mmdf.go b/collectors/mmdf.go
index 4bb9cd8..eb9899d 100644
--- a/collectors/mmdf.go
+++ b/collectors/mmdf.go
@@ -174,8 +174,8 @@ func (c *MmdfCollector) mmdfCollect(fs string) (DFMetric, error) {
 	if err != nil {
 		return DFMetric{}, err
 	}
-	dfMetric := parse_mmdf(out, c.logger)
-	return dfMetric, nil
+	dfMetric, err := parse_mmdf(out, c.logger)
+	return dfMetric, err
 }
 
 func mmlfsfsFilesystems(ctx context.Context, logger log.Logger) ([]string, error) {
@@ -204,7 +204,7 @@ func mmdf(fs string, ctx context.Context) (string, error) {
 	return out.String(), nil
 }
 
-func parse_mmdf(out string, logger log.Logger) DFMetric {
+func parse_mmdf(out string, logger log.Logger) (DFMetric, error) {
 	var dfMetrics DFMetric
 	headers := make(map[string][]string)
 	values := make(map[string][]string)
@@ -229,6 +229,14 @@ func parse_mmdf(out string, logger log.Logger) DFMetric {
 	ps := reflect.ValueOf(&dfMetrics) // pointer to struct - addressable
 	s := ps.Elem()                    // struct
 	for k, vals := range headers {
+		if _, ok := values[k]; !ok {
+			level.Error(logger).Log("msg", "Header section missing from values", "header", k)
+			return dfMetrics, fmt.Errorf("Header section missing from values: %s", k)
+		}
+		if len(vals) != len(values[k]) {
+			level.Error(logger).Log("msg", "Length of headers does not equal length of values", "header", k, "values", len(values[k]), "headers", len(vals))
+			return dfMetrics, fmt.Errorf("Length of headers does not equal length of values: %s", k)
+		}
 		for i, v := range vals {
 			mapKey := fmt.Sprintf("%s:%s", k, v)
 			value := values[k][i]
@@ -249,5 +257,5 @@ func parse_mmdf(out string, logger log.Logger) DFMetric {
 			}
 		}
 	}
-	return dfMetrics
+	return dfMetrics, nil
 }
diff --git a/collectors/mmdf_test.go b/collectors/mmdf_test.go
index f5af514..845dd4a 100644
--- a/collectors/mmdf_test.go
+++ b/collectors/mmdf_test.go
@@ -41,6 +41,35 @@ mmdf:data:0:1:::3647786188800:475190722560:13:12059515296:0:
 mmdf:metadata:0:1:::13891534848:6011299328:43:58139768:0:
 mmdf:fsTotal:0:1:::3661677723648:481202021888:14:12117655064:0:
 mmdf:inode:0:1:::430741822:484301506:915043328:1332164000:
+`
+	mmdfStdoutErrValues = `
+mmdf:nsd:HEADER:version:reserved:reserved:nsdName:storagePool:diskSize:failureGroup:metadata:data:freeBlocks:freeBlocksPct:freeFragments:freeFragmentsPct:diskAvailableForAlloc:
+mmdf:poolTotal:HEADER:version:reserved:reserved:poolName:poolSize:freeBlocks:freeBlocksPct:freeFragments:freeFragmentsPct:maxDiskSize:
+mmdf:data:HEADER:version:reserved:reserved:totalData:freeBlocks:freeBlocksPct:freeFragments:freeFragmentsPct:
+mmdf:metadata:HEADER:version:reserved:reserved:totalMetadata:freeBlocks:freeBlocksPct:freeFragments:freeFragmentsPct:
+mmdf:fsTotal:HEADER:version:reserved:reserved:fsSize:freeBlocks:freeBlocksPct:freeFragments:freeFragmentsPct:
+mmdf:inode:HEADER:version:reserved:reserved:usedInodes:freeInodes:allocatedInodes:maxInodes:
+mmdf:nsd:0:1:::P_META_VD102:system:771751936:300:Yes:No:320274944:41:5005384:1::
+mmdf:nsd:0:1:::P_DATA_VD02:data:46766489600:200:No:Yes:6092915712:13:154966272:0::
+mmdf:poolTotal:0:1:::data:3647786188800:475190722560:13:12059515296:0:3860104580096:
+mmdf:data:0:1:::3647786188800:475190722560:13:12059515296:0:
+mmdf:fsTotal:0:1:::3661677723648:481202021888:14:12117655064:0:
+mmdf:inode:0:1:::430741822:484301506:915043328:1332164000:
+`
+	mmdfStdoutErrLen = `
+mmdf:nsd:HEADER:version:reserved:reserved:nsdName:storagePool:diskSize:failureGroup:metadata:data:freeBlocks:freeBlocksPct:freeFragments:freeFragmentsPct:diskAvailableForAlloc:
+mmdf:poolTotal:HEADER:version:reserved:reserved:poolName:poolSize:freeBlocks:freeBlocksPct:freeFragments:freeFragmentsPct:maxDiskSize:
+mmdf:data:HEADER:version:reserved:reserved:totalData:freeBlocks:freeBlocksPct:freeFragments:freeFragmentsPct:
+mmdf:metadata:HEADER:version:reserved:reserved:totalMetadata:freeBlocks:freeBlocksPct:freeFragments:freeFragmentsPct:
+mmdf:fsTotal:HEADER:version:reserved:reserved:fsSize:freeBlocks:freeBlocksPct:freeFragments:freeFragmentsPct:
+mmdf:inode:HEADER:version:reserved:reserved:usedInodes:freeInodes:allocatedInodes:maxInodes:
+mmdf:nsd:0:1:::P_META_VD102:system:771751936:300:Yes:No:320274944:41:5005384:1::
+mmdf:nsd:0:1:::P_DATA_VD02:data:46766489600:200:No:Yes:6092915712:13:154966272:0::
+mmdf:poolTotal:0:1:::data:3647786188800:475190722560:13:12059515296:0:3860104580096:
+mmdf:data:0:1:::3647786188800:475190722560:13:12059515296:0:
+mmdf:metadata:0:1:::13891534848:6011299328:43:58139768:0:
+mmdf:fsTotal:0:1:::3661677723648:481202021888:14:12117655064:
+mmdf:inode:0:1:::430741822:484301506:915043328:1332164000:
 `
 )
 
@@ -93,7 +122,11 @@ func TestMmdfTimeout(t *testing.T) {
 }
 
 func TestParseMmdf(t *testing.T) {
-	dfmetrics := parse_mmdf(mmdfStdout, log.NewNopLogger())
+	dfmetrics, err := parse_mmdf(mmdfStdout, log.NewNopLogger())
+	if err != nil {
+		t.Errorf("Unexpected error: %s", err.Error())
+		return
+	}
 	if dfmetrics.InodesFree != 484301506 {
 		t.Errorf("Unexpected value for InodesFree, got %v", dfmetrics.InodesFree)
 	}
@@ -105,6 +138,19 @@ func TestParseMmdf(t *testing.T) {
 	}
 }
 
+func TestParseMmdfErrors(t *testing.T) {
+	_, err := parse_mmdf(mmdfStdoutErrValues, log.NewNopLogger())
+	if err == nil {
+		t.Errorf("Expected error")
+		return
+	}
+	_, err = parse_mmdf(mmdfStdoutErrLen, log.NewNopLogger())
+	if err == nil {
+		t.Errorf("Expected error")
+		return
+	}
+}
+
 func TestMmdfCollector(t *testing.T) {
 	if _, err := kingpin.CommandLine.Parse([]string{}); err != nil {
 		t.Fatal(err)