diff --git a/extensions/cornerstone/package.json b/extensions/cornerstone/package.json
index c191fe35d..da3fd873b 100644
--- a/extensions/cornerstone/package.json
+++ b/extensions/cornerstone/package.json
@@ -36,7 +36,7 @@
     "cornerstone-math": "^0.1.9",
     "cornerstone-tools": "^6.0.0",
     "cornerstone-wado-image-loader": "^4.0.3",
-    "dcmjs": "0.18.9",
+    "dcmjs": "0.18.10",
     "dicom-parser": "^1.8.9",
     "hammerjs": "^2.0.8",
     "prop-types": "^15.6.2",
diff --git a/extensions/dicom-html/package.json b/extensions/dicom-html/package.json
index 5904406dd..85dbc286f 100644
--- a/extensions/dicom-html/package.json
+++ b/extensions/dicom-html/package.json
@@ -29,7 +29,7 @@
   },
   "peerDependencies": {
     "@ohif/core": "^0.50.0",
-    "dcmjs": "0.18.9",
+    "dcmjs": "0.18.10",
     "prop-types": "^15.6.2",
     "react": "^16.8.6",
     "react-dom": "^16.8.6"
diff --git a/extensions/dicom-html/src/DicomHtmlViewport.js b/extensions/dicom-html/src/DicomHtmlViewport.js
index 0c4cd4fec..5acedaac9 100644
--- a/extensions/dicom-html/src/DicomHtmlViewport.js
+++ b/extensions/dicom-html/src/DicomHtmlViewport.js
@@ -217,7 +217,7 @@ class DicomHtmlViewport extends Component {
   };
 
   componentDidMount() {
-    const dataSet = this.setContentFromByteArray(this.props.byteArray);
+    this.setContentFromByteArray(this.props.byteArray);
   }
 
   setContentFromByteArray(byteArray) {
diff --git a/extensions/dicom-rt/package.json b/extensions/dicom-rt/package.json
index 9e411f98b..eff9e7360 100644
--- a/extensions/dicom-rt/package.json
+++ b/extensions/dicom-rt/package.json
@@ -31,7 +31,7 @@
     "@ohif/core": "^0.50.0",
     "cornerstone-core": "^2.5.0",
     "cornerstone-tools": "^6.0.0",
-    "dcmjs": "0.18.9",
+    "dcmjs": "0.18.10",
     "gl-matrix": "^3.3.0",
     "prop-types": "^15.6.2",
     "react": "^16.8.6",
diff --git a/extensions/dicom-rt/src/index.js b/extensions/dicom-rt/src/index.js
index 29efbcee6..383440e10 100644
--- a/extensions/dicom-rt/src/index.js
+++ b/extensions/dicom-rt/src/index.js
@@ -91,17 +91,12 @@ export default {
             }
 
             if (activeViewport) {
-              const study = studies.find(
-                s => s.StudyInstanceUID === activeViewport.StudyInstanceUID
-              );
-              const ds = study.displaySets.find(
-                ds =>
-                  ds.displaySetInstanceUID ===
-                  activeViewport.displaySetInstanceUID
-              );
               const studyMetadata = studyMetadataManager.get(
                 activeViewport.StudyInstanceUID
               );
+              if (!studyMetadata) {
+                return;
+              }
               const referencedDisplaySets = studyMetadata.getDerivedDatasets({
                 referencedSeriesInstanceUID: activeViewport.SeriesInstanceUID,
                 Modality: 'RTSTRUCT',
diff --git a/extensions/dicom-segmentation/package.json b/extensions/dicom-segmentation/package.json
index 83fe40929..3bb507d42 100644
--- a/extensions/dicom-segmentation/package.json
+++ b/extensions/dicom-segmentation/package.json
@@ -31,7 +31,7 @@
     "@ohif/core": "^0.50.0",
     "cornerstone-core": "^2.5.0",
     "cornerstone-tools": "^6.0.0",
-    "dcmjs": "0.18.9",
+    "dcmjs": "0.18.10",
     "prop-types": "^15.6.2",
     "react": "^16.8.6",
     "react-dom": "^16.8.6"
diff --git a/extensions/dicom-segmentation/src/index.js b/extensions/dicom-segmentation/src/index.js
index 3136527d2..17bd246b7 100644
--- a/extensions/dicom-segmentation/src/index.js
+++ b/extensions/dicom-segmentation/src/index.js
@@ -143,6 +143,9 @@ export default {
                       const studyMetadata = studyMetadataManager.get(
                         activeViewport.StudyInstanceUID
                       );
+                      if (!studyMetadata) {
+                        return;
+                      }
                       const referencedDS = studyMetadata.getDerivedDatasets({
                         referencedSeriesInstanceUID:
                           activeViewport.SeriesInstanceUID,
diff --git a/extensions/dicom-tag-browser/package.json b/extensions/dicom-tag-browser/package.json
index f02aa341e..4563f2a88 100644
--- a/extensions/dicom-tag-browser/package.json
+++ b/extensions/dicom-tag-browser/package.json
@@ -28,7 +28,7 @@
   },
   "peerDependencies": {
     "@ohif/core": "^2.6.0",
-    "dcmjs": "0.18.9",
+    "dcmjs": "0.18.10",
     "react": "^16.8.6"
   },
   "dependencies": {
diff --git a/extensions/vtk/package.json b/extensions/vtk/package.json
index fd1734f7f..aa0d098d6 100644
--- a/extensions/vtk/package.json
+++ b/extensions/vtk/package.json
@@ -35,7 +35,7 @@
     "cornerstone-core": "^2.5.0",
     "cornerstone-tools": "^6.0.0",
     "cornerstone-wado-image-loader": "^4.0.3",
-    "dcmjs": "0.18.9",
+    "dcmjs": "0.18.10",
     "dicom-parser": "^1.8.9",
     "i18next": "^17.0.3",
     "i18next-browser-languagedetector": "^3.0.1",
diff --git a/platform/core/package.json b/platform/core/package.json
index 1fffa1587..087678cf2 100644
--- a/platform/core/package.json
+++ b/platform/core/package.json
@@ -39,7 +39,7 @@
   "dependencies": {
     "@babel/runtime": "^7.5.5",
     "ajv": "^6.10.0",
-    "dcmjs": "0.18.9",
+    "dcmjs": "0.18.10",
     "dicomweb-client": "^0.8.1",
     "immer": "6.0.2",
     "isomorphic-base64": "^1.0.2",
diff --git a/platform/ui/src/contextProviders/SnackbarProvider.js b/platform/ui/src/contextProviders/SnackbarProvider.js
index 6e54f2334..840833af9 100644
--- a/platform/ui/src/contextProviders/SnackbarProvider.js
+++ b/platform/ui/src/contextProviders/SnackbarProvider.js
@@ -41,7 +41,7 @@ const SnackbarProvider = ({ children, service }) => {
     LogManager.subscribe(LogManager.EVENTS.OnLog, onLogHandler);
 
     return () => {
-      LogManager.subscribe(LogManager.EVENTS.OnLog, onLogHandler);
+      LogManager.unsubscribe(LogManager.EVENTS.OnLog, onLogHandler);
     };
   }, [show]);
 
diff --git a/platform/viewer/package.json b/platform/viewer/package.json
index 8660ab8e8..7271b5262 100644
--- a/platform/viewer/package.json
+++ b/platform/viewer/package.json
@@ -66,7 +66,7 @@
     "cornerstone-math": "^0.1.9",
     "cornerstone-tools": "^6.0.0",
     "cornerstone-wado-image-loader": "^4.0.3",
-    "dcmjs": "0.18.9",
+    "dcmjs": "0.18.10",
     "dicom-parser": "^1.8.9",
     "dicomweb-client": "^0.8.1",
     "hammerjs": "^2.0.8",
diff --git a/yarn.lock b/yarn.lock
index 08f3afd08..f7df087f1 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -6647,10 +6647,10 @@ dateformat@^3.0.0:
   resolved "https://registry.yarnpkg.com/dateformat/-/dateformat-3.0.3.tgz#a6e37499a4d9a9cf85ef5872044d62901c9889ae"
   integrity sha512-jyCETtSl3VMZMWeRo7iY1FL19ges1t55hMo5yaam4Jrsm5EPL89UQkoQRyiI+Yf4k8r2ZpdngkV8hr1lIdjb3Q==
 
-dcmjs@0.18.9:
-  version "0.18.9"
-  resolved "https://registry.yarnpkg.com/dcmjs/-/dcmjs-0.18.9.tgz#0e18fcff975aaae8ca01a96e781fa75c29ec97f3"
-  integrity sha512-aTu4fUo3TSgohJC+U509qdXL1per09XvlYdQva0BGtIZMr/iR5n8h/ojpcDTRJoVtSuaj331KJj1yCj8FMMK4Q==
+dcmjs@0.18.10:
+  version "0.18.10"
+  resolved "https://registry.yarnpkg.com/dcmjs/-/dcmjs-0.18.10.tgz#9e293a20dc359c7eba6c81b6afaf5a52fa841288"
+  integrity sha512-GLW1KJmzs+1ye8WA29wDy+cOHa4dYv2Q5XPQuX33X4bK5AqzS+56IzuCH+WkQXnvALZZDBFgbPztOVdUwnN4uw==
   dependencies:
     "@babel/polyfill" "^7.8.3"
     "@babel/runtime" "^7.8.4"