diff --git a/lib/algo/src/ta/algo/spec/type/bar_strategy.clj b/lib/algo/src/ta/algo/spec/type/bar_strategy.clj
index 598f83a0..52b2edc2 100644
--- a/lib/algo/src/ta/algo/spec/type/bar_strategy.clj
+++ b/lib/algo/src/ta/algo/spec/type/bar_strategy.clj
@@ -7,6 +7,16 @@
    [ta.algo.env.core :refer [get-trailing-bars]]
    [ta.algo.error-report :refer [save-error-report]]))
 
+(defn create-error [spec ex]
+  (let [filename (save-error-report (str "run-algo-" (:algo spec)) spec ex)]
+    (error "run-algo " spec " exception. details: " filename)
+    (nom/fail ::algo-calc {:message "algo calc exception!"
+                           :location :bar-strategy-algo
+                           :file filename
+                           :spec spec
+                                   ;:ds-bars ds-bars ; dataset cannot be sent to the browser.
+                           })))
+
 (defn run-algo-safe [algo-fn env spec ds-bars]
   (warn "run-algo-safe: " (:algo spec))
   (cond
@@ -25,15 +35,8 @@
     (try
       (warn "run-algo-safe else.. fn: " algo-fn)
       (algo-fn env spec ds-bars)
-      (catch Exception ex
-        (let [filename (save-error-report (str "run-algo-" (:algo spec)) spec ex)]
-          (error "run-algo " spec " exception. details: " filename)
-          (nom/fail ::algo-calc {:message "algo calc exception!"
-                                 :location :bar-strategy-algo
-                                 :file filename
-                                 :spec spec
-                                 ;:ds-bars ds-bars ; dataset cannot be sent to the browser.
-                                 }))))))
+      (catch AssertionError ex (create-error spec ex))
+      (catch Exception ex (create-error spec ex)))))
 
 (defn create-trailing-bar-loader [{:keys [asset calendar trailing-n] :as spec}]
   (cond
diff --git a/lib/engine/src/ta/engine/javelin/cell.clj b/lib/engine/src/ta/engine/javelin/cell.clj
index 44b9a875..b2026a09 100644
--- a/lib/engine/src/ta/engine/javelin/cell.clj
+++ b/lib/engine/src/ta/engine/javelin/cell.clj
@@ -10,6 +10,8 @@
     (warn "calculating formula args: " args)
     (try
       (apply formula-fn args)
+      (catch AssertionError ex 
+        (nom/fail ::error {:message "algo assert failure"}))
       (catch Exception ex
         (nom/fail ::error {:message "algo exception"})))))
 
diff --git a/lib/import/src/ta/db/bars/dynamic/import.clj b/lib/import/src/ta/db/bars/dynamic/import.clj
index ac20a6da..ab3561eb 100644
--- a/lib/import/src/ta/db/bars/dynamic/import.clj
+++ b/lib/import/src/ta/db/bars/dynamic/import.clj
@@ -41,6 +41,10 @@
         (nom/fail ::get-bars-safe {:message "import-provider has returned nil."
                                    :opts opts
                                    :task task})))
+    (catch AssertionError ex
+      (nom/fail ::get-bars-safe {:message "import-provider get-bars has thrown an assertion error"
+                                 :opts opts
+                                 :task task}))
     (catch Exception ex
       (nom/fail ::get-bars-safe {:message "import-provider get-bars has thrown an exception"
                                  :opts opts
@@ -53,6 +57,9 @@
       (info "dynamically received ds-bars! appending to db...")
       (b/append-bars (:bar-db state) opts bar-ds)
       (overview/update-range (:overview-db state) opts (:db task)))
+    (catch AssertionError ex
+      (error "dynamic-import.append-bars exception! asset: " (:asset opts) "calendar: " (:calendar opts))
+      nil)
     (catch Exception ex
       (error "dynamic-import.append-bars exception! asset: " (:asset opts) "calendar: " (:calendar opts))
       nil)))