diff --git a/src/main/java/org/verapdf/rest/resources/ValidateResource.java b/src/main/java/org/verapdf/rest/resources/ValidateResource.java
index e63cdca..bf6d75a 100644
--- a/src/main/java/org/verapdf/rest/resources/ValidateResource.java
+++ b/src/main/java/org/verapdf/rest/resources/ValidateResource.java
@@ -208,7 +208,7 @@ private static InputStream validate(InputStream uploadedInputStream, String file
     private static SeekableInputStream createInputStream(InputStream uploadedInputStream, String sha1Hex,
             Integer fileSize) {
         InputStream inputStream = uploadedInputStream;
-        if (sha1Hex != null) {
+        if (sha1Hex != null && !sha1Hex.isEmpty()) {
             MessageDigest sha1 = getDigest();
             inputStream = new DigestInputStream(uploadedInputStream, sha1);
         }
@@ -219,7 +219,7 @@ private static SeekableInputStream createInputStream(InputStream uploadedInputSt
         try {
             SeekableInputStream seekableInputStream = SeekableInputStream.getSeekableStream(inputStream,
                     CONVERTER_MB_TO_B * maxFileSize);
-            if (sha1Hex != null && !sha1Hex.equalsIgnoreCase(
+            if (sha1Hex != null && !sha1Hex.isEmpty() && !sha1Hex.equalsIgnoreCase(
                     Hex.encodeHexString(((DigestInputStream) inputStream).getMessageDigest().digest()))) {
                 throw new BadRequestException(String.format(
                         "Calculated SHA1 value %s does not match the provided value %s",
diff --git a/tests/rest_api/tests/base_test.py b/tests/rest_api/tests/base_test.py
index 2225f6e..9fca8e0 100644
--- a/tests/rest_api/tests/base_test.py
+++ b/tests/rest_api/tests/base_test.py
@@ -25,8 +25,8 @@ class BaseClass:
         ("4f", "PDFA_4_F", "PDF/A-4F validation profile", 108, ("6.2.4.2", 3)),
         ("ua1", "PDFUA_1", "PDF/UA-1 validation profile", 104, ("7.18.8", 1)),
         ("ua2", "PDFUA_2", "PDF/UA-2 + Tagged PDF validation profile", 1745, ("5", 5)),
-        ("wt1a", "WTPDF_1_0_ACCESSIBILITY", "WTPDF 1.0 Accessibility validation profile", 87, ("8.4.3", 3)),
-        ("wt1r", "WTPDF_1_0_REUSE", "WTPDF 1.0 Reuse validation profile", 74, ("8.4.5.4", 3)),
+        ("wt1a", "WTPDF_1_0_ACCESSIBILITY", "WTPDF 1.0 Accessibility validation profile", 1747, ("8.4.3", 3)),
+        ("wt1r", "WTPDF_1_0_REUSE", "WTPDF 1.0 Reuse validation profile", 1734, ("8.4.5.4", 3)),
     )
 
     FLAVOURS_LIST = sorted(